â(Future valueâ) Sarah Wiggum would like to make a singleâ lump-sum investment and have â$ 1.7 million at the time of her retirement in 34 years. She has found a mutual fund that expects to earn 8 percent annually. How much must Sarah investâ today? If Sarah earned an annual return of 16 16 âpercent, how much must she investâ today? a. If Sarah can earn 8 percent annually for the next 34 âyears, how much will she have to investâ today? â $ nothing â(Round to the nearestâ cent.)

Answers

Answer 1

Answer:

  a) at 16%: $10,936.47

  b) at 8%: $124,177.02

Step-by-step explanation:

At annual rate of return "r", the multiplier of Sarah's initial investment will be ...

  k = (1+r)^34

For r = 0.16, k ≈ 155.433166, and Sarah's investment needs to be ...

  $1.7·10^6/k ≈ $10,936.47

__

For r= 0.08, k ≈ 13.6901336, and Sarah's investment needs to be ...

  $1.7·10^6/k ≈ $124,177.02


Related Questions

1. A six person committee composed of Alice, Ben, Connie, Dolph, Egbert, and Francisco is to select a chairperson, secretary, and treasurer. How many different officer selections are there if both Dolph and Francisco must hold office?

Answers

Answer:

The number of combinations are made when one person taken at a time out of four person=4.

Step-by-step explanation:

We are given that a six person committee composed of Alice,Ben,Connie, Dolph,Egbert, and Francisco.

We have to select three persons out of six persons one is chairperson,secretary and treasurer.

We have to find the number of combinations of different officer are made when two persons Dolph and Francisco must hold office.

Now, if two persons Dolph and Francisco must hold the office then we have to select only one member out of 4 persons.

Therefore ,using combination formula

[tex]\binom{n}{r}[/tex]=[tex]\frac{n!}{r!(n-r)!}[/tex]

We have n=4 and r=1 then

The number of combination of different officer are made =[tex]\binom{4}{1}[/tex]

The number of combination of different officer are made=[tex]\frac{4!}{1!(4-1)!}[/tex]

The number of combination of different officer are made=[tex]\frac{4\times 3!}{3!}[/tex]

The number of combination of different officer are made=4

Hence, the number of combinations are made when one person taken at a time out of four person=4.

Answer: 4

If you enter the formula =A2*(1+$A$1) in cell B2 and then copy cell B2 to C2, the numerical result in cell
C2 is:

xid-10711901_1

a.200

b. 121

c. 109

d. 110

Answers

It’s is b 121 . Gang gang

Due in 1 hours, 24 minutes. Due Fri 06/28/2019 11:59 p A survey team is trying to estimate the height of a mountain above a level plain. From one point on the plain, they observe that the angle of elevation to the top of the mountain is 24°. From a point 1000 feet closer to the mountain along the plain, they find that the angle of elevation is 26 How high (in feet) is the mountain? Preview

Answers

Answer:

Height of the mountain is 5108.80 feet.

Step-by-step explanation:

From the figure attached, h is the height of a mountain AB.

At a point C angle of elevation of the mountain is 24°

Now survey team gets closer to the mountain by 1000 feet then angle of elevation is 26°.

Now from ΔABC,

tan24 = [tex]\frac{h}{x+1000}[/tex]

0.445 = [tex]\frac{h}{x+1000}[/tex]

h = 0.445(x + 1000)------(1)

From ΔABD,

tan26 = [tex]\frac{h}{x}[/tex]

0.4877 = [tex]\frac{h}{x}[/tex]

h = 0.4877x -----(2)

Now we equation 1 and equation 2

0.4452(x + 1000) = 0.4877x

0.4877x - 0.4452x = 1000(0.4452)

0.0425x = 445.20

x = [tex]\frac{445.20}{0.0425}[/tex]

x = 10475.29 feet

Now we plug in the value of x in equation 2.

h = (10475.29)×(0.4877)

h = 5108.80 feet

Therefore, height of the mountain is 5108.80 feet

If A is a 6 × 9 matrix what is the maximum possible rank of A? What is the minimum possible rank of A ?

Answers

Answer:

Largest possible rank =6

Minimum possible rank=0

Step-by-step explanation:

We are given that A is a matrix of order [tex] 6\times 9 [/tex]

We have to find the maximum possible rank and minimum possible rank of A.

In given matrix we have 6 rows and 9 columns.

Rank: Rank is defined as the number of non zero rows or columns of matrix and any row or column is not a linear  combination of other two or more rows or columns

Rank of matrix of order [tex] m\times n [/tex]

Where m< n

Then largest possible rank is m

We are given a matrix of order[tex]6\times 9[/tex] where 6< 9

Therefore, the largest possible rank is 6.

The minimum possible rank  is zero because a  given matrix can be zero matrix therefore, the rank of zero matrix is zero.

Largest possible rank =6

Minimum possible rank=0

Please help me with this

Answers

Answer:

m<1 = 45°  

m<2 = 76°

m<3 = 80°

Step-by-step explanation:

Points to remember

1). Vertically opposite angles are equal

2). Sum of angles of a triangles is 180°

To find the measures of given angles

From the figure we get,

m<1 = 45°   [Vertically opposite angles]

By using angle sum property <2 + 59 + 45 = 180

m<2 = 180 - 104

m<2 = 76°

Also m<1 + m<3 + 55 = 180

m<3 = 180 - (m<1 + 55)

 = 180 - (45 + 55)

 = 180 - 100

m<3 = 80°

Explain why p -> q is false, only when p is true and q is false. Let p: It is raining q: I will give you a ride home after class and the meaning of the truth for p-> q (If it is raining, then I will give you a ride home)

Answers

Answer:

Step-by-step explanation:

Let p : It is raining

Truth value of this statement is True.

q : I will give you a ride home after class

Truth value of the statement q is True.

So for the statement p→q (If it is raining, then I will give you a ride home)

truth value will be True.

Therefore, when statement p is True and q is False, p→q will be False.

Write an equation of the circle with center (-3, 5) and radius 4.

Answers

Answer:

(x+3)^2 + (y-5)^2 = 4^2

or

(x+3)^2 + (y-5)^2 = 16

Step-by-step explanation:

The equation of a circle can be written in the form

(x-h)^2 + (y-k)^2 = r^2

where (h,k) is the center and r is the radius

(x--3)^2 + (y-5)^2 = 4^2

(x+3)^2 + (y-5)^2 = 4^2

or

(x+3)^2 + (y-5)^2 = 16

21 y=a(x-2)2 +b y =5 in the system of equations above, for which of the following values of a and b does the system have no solution? A) a= 1 and b=-4 B) a 2 and b=5 C) a=-1 and b 6 Da-2 and b 4

Answers

Answer:

The correct option is D. a = -2 and b = 4.

Step-by-step explanation:

Consider the provided equation:

[tex]y=a(x-2)^2+b\ \text{and}\ y=5[/tex]

The vertex form of a quadratic is:

[tex]y= a(x-h)^2+k[/tex]

Where, (h,k) is the vertex and the quadratic opens up if 'a' is positive and opens down if 'a' is negative.

Now consider the provided option A. a = 1 and b = -4.

Since the value of a is positive the graph opens up and having vertex (2,-4). Thus graph will intersect the line y = 5.

Refer the figure 1:

Now consider the option B. a = 2 and b = 5.

Since the value of a is positive the graph opens up and having vertex (2,5). Thus graph will intersect the line y = 5.

Refer the figure 2:

Now consider the option C. a = -1 and b = 6.

Since the value of a is negative the graph opens down and having vertex (2,6). Thus graph will intersect the line y = 5.

Refer the figure 3:

Now consider the option D. a = -2 and b = 4.

Since the value of a is negative the graph opens down and having vertex (2,4). Thus graph will not intersect the line y = 5.

Refer the figure 4:

Hence, the correct option is D. a = -2 and b = 4.

A statistics professor plans classes so carefully that the lengths of her classes are uniformly distributed between 50.0 and 52.0 minutes. Find the probability that a given class period runs between 51.25 and 51.5 minutes.

Answers

Answer: 0.125

Step-by-step explanation:

Given: A statistics professor plans classes so carefully that the lengths of her classes are uniformly distributed in interval (50,52).

∴ The probability density function of X will be :-

[tex]f(x)=\dfrac{1}{b-a}=\dfrac{1}{52-50}=\dfrac{1}{2}[/tex]

The required probability will be:-

[tex]P(51.25<x<51.5)=\int^{51.5}_{51.25}f(x)\ dx\\\\=\dfrac{1}{2}\int^{51.5}_{51.25}\ dx\\\\=\dfrac{1}{2}[x]^{51.5}_{51.25}\\\\=\dfrac{1}{2}(51.5-51.25)=\dfrac{0.25}{2}=0.125[/tex]

Hence, the probability that a given class period runs between 51.25 and 51.5 minutes =0.125

Find a polynomial f(x) of degree 3 that has the following zeros.
9, 0, -5

Leave your answer in factored form.

Answers

Answer:

[tex]f (x) = x (x + 5) (x-9)[/tex]

Step-by-step explanation:

The zeros of the polynomial are all the values of x for which the function [tex]f (x) = 0[/tex]

In this case we know that the zeros are:

[tex]x = 9,\  x-9 =0[/tex]

[tex]x = 0[/tex]

[tex]x = -5[/tex], [tex]x + 5 = 0[/tex]

Now we can write the polynomial as a product of its factors

[tex]f (x) = x (x + 5) (x-9)[/tex]

Note that the polynomial is of degree 3 because the greatest exponent of the variable x that results from multiplying the factors of f (x) is 3

Final answer:

The polynomial f(x) of degree 3 that has the zeros 9, 0, and -5 can be found by setting up and multiplying the factors (x-9), (x-0), and (x+5). The resulting polynomial f(x) is therefore x(x - 9)(x + 5).

Explanation:

To find a polynomial f(x) of degree 3 that has the given zeros, you use the fact that the zeros (or roots) of a polynomial are the values that make the polynomial equal to zero. In this case, the zeros are 9, 0, and -5. Consequently, the factors of the polynomial are (x-9), (x-0), and (x+5).

Now multiply these factors together to get the polynomial. The result is:

f(x) = x(x - 9)(x + 5).

This is the polynomial of degree 3 with the given zeros.

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g Water use in the summer is normally distributed with a mean of 310.4 million gallons per day and a standard deviation of 40 million gallons per day. City reservoirs have a combined storage capacity of 350 million gallons. The probability that a day requires more water than is stored in city reservoirs is P(X > 350)= 1 - P (Z < b). What is the value of b? Please report your answer in 3 decimal places.

Answers

Answer: The value of b = 0.99

The probability that a day requires more water than is stored in city reservoirs is 0.161.

Step-by-step explanation:

Given : Water use in the summer is normally distributed with

[tex]\mu=310.4\text{ million gallons per day}[/tex]

Standard deviation : [tex]\sigma=40 \text{ million gallons per day}[/tex]

Let x be the combined storage capacity requires by the reservoir on a random day.

Z-score : [tex]\dfrac{x-\mu}{\sigma}[/tex]

[tex]z=\dfrac{350-310.4}{40}=0.99[/tex]

The probability that a day requires more water than is stored in city reservoirs is  :

[tex]P(x>350)=P(z>0.99)=1-P(z<0.99)\\\\=1-0.8389129=0.1610871\approx0.161[/tex]    

Hence, the probability that a day requires more water than is stored in city reservoirs is 0.161

Examine the intersection of these lines:

∠B and ∠C are complementary angles.
∠E and ∠F are complementary angles.

Which of the following other pairs of angles are complementary? Select all that apply.

∠A and ∠C

∠B and ∠F

∠C and ∠D

∠F and ∠E

∠D and ∠F​

Answers

Answer:

∠B and ∠F∠F and ∠E . . . already listed in the problem statement, so may not be considered an "other pair"

Step-by-step explanation:

∠C and ∠F are vertical angles, so are congruent. Then any angle complementary to one of those will also be complementary to the other.

Likewise, ∠B and ∠E are vertical angles and congruent. Any angle complementary to one of them will also be complementary to the other. Here, ∠E and ∠F are listed as complementary, so we know ∠B and ∠F will be also.

Answer:2 and 4

Step-by-step explanation:

^B and ^F

^F and ^E

How many gallons of a 20% acid solution should be mixed with 30 gallons of a 40% solution, to obtain a mixture of 30% acid solution.

Answers

Answer:

30 gallons of 20% acid solution should be mixed.

Step-by-step explanation:

Let x gallons of a 20% acid solution was mixed with 30 gallons of a 40% solution, to obtain a mixture of 30% acid solution.

Therefore, final volume of the solution will be (x + 30) gallons.

Now concept to solve this question is

20%.(x) + 40%.(30) = 30%.(x + 30)

0.20(x) + 0.40(30) = 0.30(x + 30)

0.20x + 12 = 0.30x + 9

0.30x - 0.20x = 12 - 9

.10x = 3

x = [tex]\frac{3}{0.1}[/tex]

x = 30 gallons

Therefore, 30 gallons of the 20% acid solution should be mixed.

y=sin(in(2x^5)) find the derivative

Answers

Answer:

[tex]y'=\frac{5}{x} \cdot \cos(\ln(2x^5))[/tex]

Step-by-step explanation:

[tex]y=\sin(\ln(2x^5))[/tex]

We are going to use chain rule.

The most inside function is [tex]y=2x^5[/tex] which gives us [tex]y'=10x^4[/tex].

The next inside function going out is [tex]y=\ln(x)[/tex] which gives us [tex]y'=\frac{1}{x}[/tex].

The most outside function is [tex]y=\sin(x)[/tex] which gives us [tex]y'=\cos(x)[/tex].

[tex]y'=10x^4 \cdot \frac{1}{2x^5} \cdot \cos(\ln(2x^5))[/tex]

[tex]y'=\frac{5}{x} \cdot \cos(\ln(2x^5))[/tex]

Seed costs for a farmer are ​$60 per acre for corn and $80 per acre for soybeans. How many acres of each crop should the farmer plant if she wants to spend no more than $4800 on​ seed? Express your answer as a linear inequality with appropriate nonnegative restrictions and draw its graph.

Let x be the number of acres planted with corn and let y be the number of acres planted with soybeans. Choose the correct inequality below.

A. 60x+80y>=4800, x>=0, y>=0

B. 60x+80y<=4800, x>=0, y>=0

C. 60x+80y>4800, x>=0, y>=0

D. 60x+80y<4800, x>=0, y>=0

Answers

Answer:

B

Step-by-step explanation:

Let x = acres of corn and

     y = acres of soybean

If the cost of corn is 60 per acre, we represent that as 60x.

If the cost of soybean is 80 per acre, we represent that as 80y.  

The addition of these 2 grains cannot go over 4800; that means that it can be 4800 on the dot, but it cannot be more.  So "less than or equal to" is our sign.  Putting that all together:

60x + 80y ≤ 4800

A scientist has two solutions, which she has labeled Solution A and Solution B. Each contains salt. She knows that Solution A is 40% salt and Solution B is 65% salt. She wants to obtain 110 ounces of a mixture that is 55% salt. How many ounces of each solution should she use?

Answers

Final answer:

The scientist can determine the amount of Solution A and Solution B required by setting up and solving a system of two linear equations representing the total solution volume and the total salt amount.

Explanation:

Lets let the amount of Solution A the scientist will use be x and the amount of Solution B she will also use be y. We know that x + y = 110 ounces because her final mix should be 110 ounces. Also, we know that 0.4x + 0.65y = 0.55*(x+y) = 60.5 because the amount of salt from Solution A and Solution B should add up to the amount of salt in the final mixture. Solving this system of linear equations to obtain the values for x and y, gives the required amounts of Solution A and Solution B needed.

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Let U=(4, 5, 6, 7, 8, 9, 10, 11), A = (s, 7, 9), B following. (Enter your answers as a comma-separated list.) {4, 5, 8, 11), and C = (4, 6, 10). Find the (A U B) n (Bn C')

Answers

Answer:  (A U B) n (B n C') = {5, 8, 11}.

Step-by-step explanation:  We are given the following sets :

U = {4, 5, 6, 7, 8, 9, 10, 11},

A = {5, 7, 9},

B = {4, 5, 8, 11}

and

C = {4, 6, 10}.

We are to find the following :

(A U B) n (B n C')

We know that for any two sets A and B,

A ∪ B contains all the elements present in set A or set B or both,

A ∩ B contains all the elements present in both A and B,

A - B contains all those elements which are present in A but not B

and

A' contains all the elements present in the universal set U but not A.

We will be suing the following rule of set of theory :

A ∩ B' = A - B.

Therefore, we have

[tex](A\cup B)\cap(B\cap C')\\\\=(A\cup B)\cap (B-C)\\\\=(\{5,7,9\}\cup\{4,5,8,11\})\cap (\{4,5,8,11\}-\{4,6,10\})\\\\=\{4,5,7,8,9,11\}\cap\{5,8,11\}\\\\=\{5,8,11\}.[/tex]

Thus,  (A U B) n (B n C') = {5, 8, 11}.

Final answer:

To solve the set operation (A U B) n (B n C'), we first find the union of A and B, then the complement of C, and the intersection of B and C'. The final step is to intersect the results of (A U B) and (B n C'), which gives us {4, 5, 8, 11}.

Explanation:

The question involves operations on sets, specifically union, intersection, and complement. We have a universal set U and subsets A, B, and C. The objective is to find the result of (A U B) n (B n C'), which involves set union (U), set intersection (n), and the complement of a set (').

First, let's find the union of sets A and B: A U B = {s, 7, 9, 4, 5, 8, 11}.

Next, we need to find the complement of set C, which is C' = {4, 5, 7, 8, 9, 11} as these are the elements of U that are not in C.

Then, identify the intersection of sets B and C': B n C' = {4, 5, 8, 11}, because these elements are common to both B and C'.

Finally, we find the intersection of the two results: (A U B) n (B n C') = {4, 5, 8, 11}.

Find an explicit solution (solved for y) of the given initial-value problem in terms of an integral function. dy/dx + 3y = e^x^5, y(2) = 5.

Answers

Answer:

Step-by-step explanation:

Using linear differential equation method:

\frac{\mathrm{d} y}{\mathrm{d} x}+3y=e^5^x

I.F.= [tex]e^{\int {Q} \, dx }[/tex]

I.F.=[tex]e^{\int {3} \, dx }[/tex]

I.F.=[tex]e^{3x}[/tex]

y(x)=[tex]\frac{1}{e^{3x}}[\int {e^{5x}} \, dx+c][/tex]

y(x)=[tex]\frac{e^{2x}}{5}+e^{-3x}\times c[/tex]

substituting x=2

c=[tex]\frac{25-e^4}{5e^{-6}}[/tex]

Now

y=[tex]\frac{e^{2x}}{5}+e^{-3x}\times \frac{25-e^4}{5e^{-6}}[/tex]

Let A, B R be non-empty sets. Suppose that A B. Suppose that B has a least upper bound. Prove that A has a least upper bound, and lub A lessthanorequalto lub B.

Answers

Answer with explanation:

Given → A, B ⊆R, are non-empty sets.

Also, A ⊆ B.

It is also given that , B has least upper bound.

To Prove:→A has a least upper bound,

and → lub A ≤ lub B.

Proof:

    A and B are non empty sets.

Also, A ⊆ B

it means there are some elements in B which is not in A and there are some elements in set B which may be greater or smaller than or equal to set A.

The meaning of least upper bound is the the smallest member of the set from which all members are greater.

As, A⊆B

So, there are two possibilities ,either

→ Least upper bound set A = least upper bound set B------(1)

→ Least upper bound set A < least upper bound set B-------(2)

Combining (1) and (2)

→→→l u b(A) ≤ l u b (B)

   

 

When Mendel conducted his famous genetics experiments with peas, one sample of offspring consisted of 428 green peas and 155 yellow peas for a total of 583 peas. a) Find a 95% confidence interval estimate of the percentage of yellow peas and then interpret your answer.

Answers

Answer:

(0.23, 0.30)

Step-by-step explanation:

Number of green peas = 428

Number of yellow peas = 155

Total number of peas = n = 583

Since we have to establish the confidence interval for yellow peas, the sample proportion of yellow peas would be considered as success i.e. p = [tex]\frac{155}{583}[/tex]

q = 1 - p = [tex]\frac{428}{583}[/tex]

Confidence Level = 95%

Z value associated with this confidence level = z = 1.96

Confidence interval for the population proportion is calculated as:

[tex](p-z\sqrt{\frac{pq}{n}} ,p+z\sqrt{\frac{pq}{n}})[/tex]

Using the values, we get:

[tex](\frac{155}{583}-1.96\sqrt{\frac{\frac{155}{583} \times\frac{428}{583}}{583} },\frac{155}{583}+1.96\sqrt{\frac{\frac{155}{583} \times\frac{428}{583}}{583} })\\\\ =(0.23,0.30)[/tex]

Conclusion:

We are 95% confident that true value of population proportion of yellow peas lie between 0.23 and 0.30

Which of the following functions from R rightarrow R are one-to-one (injective), onto (surjective), or both (bijective)? Prove your answers. a. f(x) = 5x + 4 b. g(x) = 2x^2 - 2 c. h(x)= 1 + 2/x, x notequalto 0.

Answers

Answer:

a) bijective

b) neither surjective or injective

c) injective

Step-by-step explanation:

Since we are looking from real numbers to real numbers, we want the following things

1) We want every real number y to get it. (surjective)

2) We want every y that gets hit to be hit only once. (injective).

---

If we have both things then the function is bijective.

a) f(x)=5x+4 this is a line with a positive slope.

That means it is increasing left to right.  Every increasing or even decreasing line is going to hit every real number y.  This is a bijection.

b) g(x)=2x^2-2 is a parabola. Parabola functions always have y's that get hit more than once and not all y's get hit because the parabola is either open up or down starting from the vertex.  This function is neither injective or surjective.

c) h(x)=1+(2/x)  x is not 0.

1+(2/x) is never 1 because 2/x is never 0 for any x. This means the real number y=1 will never be hit and is therefore not surjective. This function is injective because every 1 that is hit is only hit once. If you want use the horizontal line test to see this.

An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of "2.7" non-work-related e-mails per hour. Assume the arrival of these e-mails is approximated by the Poisson distribution. a. What is the probability Linda Lahey, company president, received exactly 3 non-work-related e-mails between 4 P.M. and 5 P.M. yesterday

Answers

Answer: 0.2205

Step-by-step explanation:

Given : Technology Services department at Lahey Electronics revealed company employees receive an average of "2.7" non-work-related e-mails per hour.

i.e. [tex]\lambda = 2.7[/tex]

If the arrival of these e-mails is approximated by the Poisson distribution.

Then , the required probability is given by :-

[tex]P(X=x)=\dfrac{\lambda^xe^{-\lambda}}{x!}\\\\P(X=3)=\dfrac{(2.7)^3e^{-2.7}}{3!}\\\\=0.22046768454\approx0.2205[/tex]

Hence, the probability Linda Lahey, company president, received exactly 3 non-work-related e-mails between 4 P.M. and 5 P.M. yesterday =0.2205

To determine the probability that Linda Lahey received exactly 3 non-work-related e-mails in one hour based on a Poisson distribution with an average rate of 2.7 e-mails per hour, we apply the Poisson formula. This calculation offers a precise way to understand the likelihood of such an event occurring within a set timeframe.

Given that, on average, company employees receive 2.7 non-work-related e-mails per hour, we can use the Poisson formula to calculate this probability.

To find the probability of receiving exactly k events in a fixed interval of time, we use the formula:
P(X = k) = (λ^k * e^-λ) / k!
where λ is the average rate (2.7 emails per hour in this case), k is the number of events (3 emails), and e is the base of the natural logarithm (approximately 2.71828).

Plugging in the values, we calculate the probability as follows:
P(X = 3) = (2.7^3 * e^-2.7) / 3!
This calculation gives us the specific probability that Linda Lahey received exactly 3 non-work-related e-mails in one hour.

In a circle with a diameter of 25.2 ft, an arc is intercepted by a central angle of 168º.

What is the arc length?

Use 3.14 for π and round your final answer to the nearest hundredth.

Enter your answer as a decimal in the box.

Answers

Answer:

[tex]36.93\ ft[/tex]

Step-by-step explanation:

step 1

Find the circumference of the circle

The circumference is equal to

[tex]C=\pi D[/tex]

we have

[tex]D=25.2\ ft[/tex]

substitute

[tex]C=25.2\pi\ ft[/tex]

step 2

we know that

The circumference of a circle subtends a central angle of 360 degrees

so

using proportion

Find out the arc length by a central angle of 168 degrees

[tex]\frac{25.2\pi}{360}=\frac{x}{168}\\\\x=25.2\pi*168/360\\\\x=(25.2*3.14)*168/360\\\\x=36.93\ ft[/tex]

A motorboat takes 5 hours to travel 150km going upstream. The return trip takes 3 hours going downstream. What is the rate of the boat in still water and what is the rate of the current?

Answers

Answer:

=10km/h

Step-by-step explanation:

Let motor boat speed be represented by x and current y

The speed upstream = Motor boats speed - rate of current

=x-y

The net speed down stream = Motor boats speed + rate of current

=x+y

Let us find the speed upstream =distance/ time taken

=150km/5hrs

=30km/h

Speed down stream= 150km/3h

=50 km/h

The problem forms simultaneous equations.

x-y=30

x+y=50

Using elimination method we solve the equations.

Add the two equations to eliminate y.

2x=80

x=40

Current, y= 50-x

=10km/h

Answer:

1) [tex]40\ \frac{km}{h}[/tex]

2) [tex]10\ \frac{km}{h}[/tex]

Step-by-step explanation:

 Let' call "b" the speed of the motorboat and "c" the speed of the current.

We know that:

[tex]V=\frac{d}{t}[/tex]

Where "V" is the speed, "d" is distance and "t" is time.

Then:

[tex]d=V*t[/tex]

We know that distance traveled upstream is 150 km and the time is 5 hours. Then, we set up the folllowing equation:

 [tex]5(b-c)=150[/tex]  (Remember that in the trip upstream the speed of the river is opposite to the motorboat)

For the return trip:

 [tex]3(b+c)=150[/tex]  

 By solving the system of equations, we get:

- Make both equations equal to each other and solve for "c".

[tex]5(b-c)=3(b+c)\\\\5b-5c=3b+3c\\\\5b-3b=3c+5c\\\\2b=8c\\\\c=\frac{b}{4}[/tex]

- Substitute "c" into the any original equation and solve for "b":

[tex]5(b-\frac{b}{4})=150\\\\\frac{3}{4}b=30\\\\b=40\ \frac{km}{h}[/tex]

- Substitute "b" into [tex]c=\frac{b}{4}[/tex]:

[tex]c=\frac{40}{4}\\\\c=10\ \frac{km}{h}[/tex]

It is claimed that 10 year old boys and girls both have the same average height (52 inches). A researcher studies 65 boys and finds that their average height is 52.8 with a variance of 98. The 111 girls in the study had an average height of 54.1 with a variance of 123. Construct a 95% confidence interval for the difference in the heights of 10 year old boys and girls based on these samples. Does the confidence interval support the claim that 10 year old boys and girls have the same average height?

Answers

Answer:

Step-by-step explanation:

Let us calculate std dev and std error of two samples

Sample     N     Mean    Std dev   Std error

  1              65     52.8      9.9         1.22279

  2             111      54.1       11.09      1.0526

Assuming equal variances

df =111+65-2=174

Pooled std deviation = combined std deviation = 10.6677

Pooled std error = 10.6677/sqrt 174 = 0.808

difference in means =52.8-54.1 = -1.3

Margin of error = 0.5923

( t critical 1.6660)

Confidence interval

=(-4.4923, 1.8923)

Since 0 lies in this interval we can accept null hypothesis that 10 year old boys and girls have the same average height

A metal bar is to be divided into two pieces so that one piece is 3 centimeters longer than twice the length of the other. If the sum of the squares of the two lengths is 109 square centimeters, find the two lengths

Answers

Answer:

The two lengths are 3.4303 and 9.8606 centimeters

Step-by-step explanation:

The metal bar is divided into two pieces, so we are going to call X the length of the first piece and Y the length of the second piece.

From the phrase: one piece is 3 centimeters longer than twice the length of the other, we can separate and rewrite as:

One piece - is - 3 centimeters - longer than - twice the length of the other

X                   =               3                      +               2         *       Y

So, X=3+2Y is our first equation

From the phrase: the sum of the squares of the two lengths is 109 square centimeters, we can rewrite as:

The sum of the squares of the two lengths - is - 109 square centimeters

               [tex]X^{2} +Y^{2}[/tex]                                            =      109

So, X^2+Y^2=109 is our second equation

Replacing the first equation on the second question we get:

[tex]X^{2} +Y^{2} =109\\(3+2Y)^{2} +Y^{2} =109[/tex]

[tex]9+(2*3*2Y)+4Y^{2} +Y^{2} -109=0[/tex]

[tex]5Y^{2} +12Y-100=0[/tex]

Solving this equation we find two solutions:

Y=3.4303 and Y= -5.8303

Since the question is talking about the length there is no sense use Y=-5.8303, then our first length is 3.4303

So replacing this value on the first equation we get:

X= 3 + 2*Y

X= 3 + 2*3.4303

X= 9.8606

Finally the two length are 3.4303 and 9.8606 centimeters

What is the contrapositive of the following: "If I form a study group then I raise my grades." A. If I work alone then I lower my grades. B. If I raise my grades then I form a study group. C. If I lower my grades then I work alone D. If I form a study group then I lower my grades. E. If I form a study group then I raise my grades. F. If I raise my grades then I work alone.

Answers

Answer:

C. If I lower my grades then I work alone

Step-by-step explanation:

In logic, the contrapositive of a conditional statement, [tex]P\to Q[/tex] is [tex]\neg Q\to \neg P[/tex].

In other words, the contrapositive of "If P then Q" is "If not Q, then not P".

The given conditional statement is:

"If I form a study group then I raise my grades."

We can break this conditional statement into the following propositional statements:

P : I form a study group

¬P : I work alone

Q : I raise my grades

¬Q : I lower my grades

The contrapositive of  "If I form a study group then I raise my grades." becomes:

" If I lower my grades then I work alone"

The correct choice is C

To find the contrapositive of the given conditional statement "If I form a study group then I raise my grades," we have to negate both the hypothesis (the "if" or P part) and the conclusion (the "then" or Q part) and also reverse their order.
The original statement is in the form: If P then Q.
P: I form a study group.
Q: I raise my grades.
The contrapositive is: If not Q then not P.
Not Q: I do not raise my grades.
Not P: I do not form a study group.
So, the contrapositive of the original statement would be: "If I do not raise my grades then I do not form a study group."
Now let's match this to one of the choices given:
A. If I work alone then I lower my grades. (This is not the contrapositive; it introduces new concepts that weren't part of the original statement.)
B. If I raise my grades then I form a study group. (This is the converse, not the contrapositive.)
C. If I lower my grades then I work alone. (This is the contrapositive: "lower my grades" is equivalent to "do not raise my grades," and "work alone" is equivalent to "do not form a study group.")
D. If I form a study group then I lower my grades. (This is not the contrapositive; it's the inverse of the original statement.)
E. If I form a study group then I raise my grades. (This is the original statement.)
F. If I raise my grades then I work alone. (This is not the contrapositive; it introduces the concept of working alone.)
The correct choice that represents the contrapositive of the original statement is C. If I lower my grades then I work alone.

On April 1, the men s furnishings department had an opening inventory of $170,000 at retail with a markup of 48.0%. During the month the buyer purchased additional merchandise which was $80,000 in retail with a 52.0% markup. Determine the cumulative markup percent for the department at the end of April (Show two decimal places).

Answers

Answer: There is 49.28% of cumulative markup for the department at the end of April.

Step-by-step explanation:

Since we have given that

Price of opening inventory = $170,000

Mark up rate = 48%

Amount of mark up is given by

[tex]\dfrac{48}{100}\times 170000\\\\=\$81600[/tex]

Price of additional merchandise = $80000

Mark up rate = 52%

Amount of mark up is given by

[tex]\dfrac{52}{100}\times 80000\\\\=\$41600[/tex]

So, total mark up would be

$81600 + $41600 = 123200

So, the cumulative markup percentage for the department at the end of April is given by

[tex]\dfrac{123200}{170000+80000}\times 100=\dfrac{123200}{250000}\times 100=49.28\%[/tex]

Hence, there is 49.28% of cumulative markup for the department at the end of April.

In The Godfather which brother is sent to Las Vegas? Sony b. Tom a C. Fredo d. Paulie

Answers

Answer:

The correct option is C. Fredo

Step-by-step explanation:

In a Mario Puzo's fictional novel named The Godfather, Frederico Corleone or Fredo is a fictional character. In the novel, Fredo's father is killed by the assasins. Witnissing his father being shot, Fredo goes into a shock.

To protect and aid Fredo's recovery, his elder brother Sonny, sends him to Las Vegas.

Therefore, Fredo is sent to Las Vegas

The Crabby Apple restaurant lost $2500 in January. If its net worth at the end of the month was $400, what was its net worth at the beginning of the month?

Answers

Final answer:

To find the net worth of the Crabby Apple restaurant at the beginning of January before it lost $2500, we add back the loss to the net worth at the end of the month, resulting in an initial net worth of $2900.

Explanation:

The student is asking about calculating the net worth of a restaurant before a financial loss. To find the net worth at the beginning of the month, we would add the loss sustained during that month back to the net worth at the end of the month. Since the restaurant lost $2500 in January, and had a net worth of $400 at the end of January, we can calculate its net worth at the beginning of January by the following calculation:

Net Worth at Beginning of Month = Net Worth at End of Month + Loss During Month

Net Worth at Beginning of Month = $400 + $2500

Net Worth at Beginning of Month = $2900

Therefore, the net worth of the Crabby Apple restaurant at the beginning of January was $2900.

The net worth of the Crabby Apple restaurant at the beginning of January was $2900.

To determine the net worth of the Crabby Apple restaurant at the beginning of January, we need to account for the loss incurred during the month. Given that the net worth at the end of January is $400 and the restaurant lost $2500 during the month, we can set up the following equation:

[tex]\[\text{Net worth at the beginning of January} =[/tex][tex]\text{Net worth at the end of January} + \text{Loss during January}\][/tex]

Substitute the given values into the equation:

[tex]\[\text{Net worth at the beginning of January} = \$400 + \$2500\][/tex]

[tex]\[\text{Net worth at the beginning of January} = \$2900\][/tex]

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