In the last math test andrew answered 80% of all the questions correctly.If he answered 32 questions correctly, what was the total number of questions in the math test?

Answer:

options 1,3,4 are functions.

Step-by-step explanation:

RULE: a relation is said to be a function if every element in the domain ( the numbers in the left side in the below sets) is related to only one number ( number on the right side in the below sets).

Let us check each option one by one:

1.   3           2

    9           1

   -4           7

    0          -2

here each number on the left side is mapped to or is related to one number only.

so this relation is a function

2.  7         1

    -5        2,3

     1         0

here, "-5" is mapped to two different numbers. so this relation is not a function.

3.  -2    -4

    2      4

    6      8

    -6    -8

here each number on the left side is mapped to or is related to one number only.

so this relation is a function

4.  1     3

   -1    3

   2    3

  -2    3

here each number on the left side is mapped to or is related to one number only.

so this relation is a function.

even if it is related to the same number, it doesn't matter.

it should follow the above given rule that's it.

There are 9 students in only one of the two clubs.

Step-by-step explanation:

Since we have given that

Number of students = 36

Number of students are in chess club = 10

Number of students are in bridge club = 13

Number of students are not in either club = 20

So, Number of students in both the club is given by

[tex]Total=n(chess)+n(bridge)-n(both)+n(neither)\\\\36=10+13-n(both)+20\\\\36=43-n(both)\\\\36-43=n(both)\\\\-7=-n(both)\\\\n(both)=7[/tex]

Number of students only in chess = 10-7 =3

Number of students only in bridge = 13-7=6

Hence, there are 3+6=9 students in only one of the two clubs.

Answer:

the probability that the combined sample tests positive for anemia is ≈ 0,38.

Thus it is 38% likely that such a combined sample to test is positive.

Step-by-step explanation:

The combined sample tests positive if at least one of the 8 women has anemia.

Let p be the probability that a women 65 years of age and older have anemia

Then p=0.1

The probability that one of the 8 women has anemia and others does not is:

p×[tex]p^{7}[/tex] .

Since there are 8 combinations of this probability is possible, the probability that at least one of the 8 woman has anemia is:

8×p×[tex]p^{7}[/tex] =8×0.1×[tex]0.9^{7}[/tex] ≈ 0,3826

The probability that a combined sample of blood from 8 women aged 65 and older tests positive for anemia is approximately 56.95%, making it likely for the sample to test positive. This probability is calculated using the complement rule in probability.

To determine the probability that a combined sample of blood from 8 women aged 65 and older tests positive for anemia, we need to use the complement rule and properties of probability.

Given:
- Probability that one woman has anemia (success): 10% or 0.10
- Probability that one woman does not have anemia (failure): 90% or 0.90
- Number of women sampled: 8

The probability that all 8 women do not have anemia can be calculated as:

[tex](0.90)^8[/tex]

Now let's compute this:

[tex](0.90)^8[/tex]  ≈ 0.4305

This means there is an approximately 43.05% probability that none of the 8 women have anemia. Therefore, the probability that at least one woman in the sample has anemia is:

1 - 0.4305 ≈ 0.5695 or 56.95%

Since the probability is greater than 50%, it's quite likely that such a combined sample will test positive for anemia.

Answer:

The answer to your question is [tex]f(x) = \sqrt{x+ 4}[/tex]

Step-by-step explanation:

                                           f(x) = x² - 4

Process

1.- Change f(x) for y

                                           y = x² - 4

2.- Change "x" for "y" and "y" for "x".

                                           x = y² - 4

3.- Make "y" the object of the equation

                                          y² = x + 4

                                          [tex]y = \sqrt{x+ 4}[/tex]

4.- Change "y" for f(x)

                                          [tex]f(x) = \sqrt{x+ 4}[/tex]

Answer:

  y - 285 = 45(x - 3)

Step-by-step explanation:

The given point is (hours, fee) = (3, 285), and the slope is given as 45 per hour.

The point-slope form of the equation for a line is ...

  y - k = m(x - h) . . . . . . . for a slope m and a point (h, k)

Using the given values, and letting x stand for the number of hours, the equation is ...

  y - 285 = 45(x - 3)

Answer:

y - 285 = 45(x - 3)

Step-by-step explanation:

Answer: the woman drives 16.9 miles before she stops for coffee

Step-by-step explanation:

A woman drives 169/4 miles to work each day. She stops for coffee at a shop that is 2/5 of the way to her job.

To determine how far the woman drives before she stops for coffee, we will multiply the total miles to her job each day by the fraction of the total miles that she drives before stopping at the coffee shop. It becomes

2/5 × 169/4 = 16.9 miles

Final answer:

The total distance the spaceship traveled is 5/6 of a light-year, which was obtained by adding 3/4 and 1/12 light years together after finding a common denominator for the fractions.

Explanation:

The student's question is about calculating the total distance a spaceship travels based on two separate distances given in light years. To find this total distance, we will perform an addition of the two distances.

First, the spaceship traveled 3/4 of a light-year to a space station. Then, it traveled an additional 1/12 of a light-year to a planet.

To get the total distance traveled, we simply add the two distances:

To add these fractions, we need a common denominator, which is 12 in this case:

Now, when we add these fractions, we get:

We can simplify this fraction to:

Therefore, the spaceship traveled a total of 5/6 of a light-year.

Answer:

60 miles/hour

Step-by-step explanation:

840 miles divided by 14 hours

840/14=60 miles per hour

Answer: A) 1260

Step-by-step explanation:

We know that the number of combinations of n things taking r at a time is given by :-

[tex]^nC_r=\dfrac{n!}{(n-r)!r!}[/tex]

Given : Total multiple-choice questions  = 9

Total open-ended problems=6

If an examine must answer 6 of the multiple-choice questions and 4 of the open-ended problems ,

No. of ways to answer 6 multiple-choice questions

= [tex]^9C_6=\dfrac{9!}{6!(9-6)!}=\dfrac{9\times8\times7\times6!}{6!3!}=84[/tex]

No. of ways to answer 4 open-ended problems

= [tex]^6C_4=\dfrac{6!}{4!(6-4)!}=\dfrac{6\times5\times4!}{4!2!}=15[/tex]

Then by using the Fundamental principal of counting the number of ways can the questions and problems be chosen = No. of ways to answer 6 multiple-choice questions x No. of ways to answer 4 open-ended problems

= [tex]84\times15=1260[/tex]

Hence, the correct answer is option A) 1260

To solve the problem, use the combination formula to find the number of ways to choose 6 multiple-choice questions from 9 and 4 open-ended problems from 6, then multiply the results. The answer is  Option(D) 1260.

Solution to the Question

To determine the number of ways to choose 6 multiple-choice questions out of 9, and 4 open-ended problems out of 6, we can use combinations.

The number of ways to choose 6 multiple-choice questions out of 9 is given by the combination formula:

C(9, 6) = 9! / (6! * (9-6)!) = 84.

Similarly, the number of ways to choose 4 open-ended problems out of 6 is given by:

C(6, 4) = 6! / (4! * (6-4)!) = 15.

Now, multiply these two results to get the total number of ways to choose the questions:

84 * 15 = 1260.

Therefore, the answer is A) 1260.

Answer: $1548

Step-by-step explanation:

We are told the normal rate of payment is $36 per hour

and with an excess of 40 hours the pay will be 1 and a half the normal rate(1.5)

And John works for 42hours

For first we know John worked for an excess of 2 hours

And calculating his pay for 40hours of the normal rate that week, we multiply $36 by 40 which will give $1440

Then the extra 2 hours, the new pay rate will be $36 multiplied by 1.5 which will give $54 per hour

And for the extra 2 hours, John will get extra $54 multiplied by 2 which will give $108

Adding both $1440 and $108, we will get $1548

The solution to the system of equations represents the break-even point for the production and sale of sweatshirts, indicating the number of units that must be sold to cover production costs.

The solution of the system of equations y=35x and y=-0.05(x-400)^2+9,492 represents the break-even point where the money collected from selling x number of sweatshirts equals the money spent to produce those sweatshirts. In this context, solving the system means finding the number of sweatshirts (x) that need to be sold at $35 each to exactly cover the production costs described by the second equation.

This involves first substituting the expression for y from the first equation into the second equation, then solving for x to find the exact point where income equals expenses. Once x is found, it can be plugged back into either equation to verify the break-even amount of money (y).

Answer:

P = 0.55   or  55 %

Step-by-step explanation:

First step:  Fred has probability of 0,5 when chossing jar 1 or jar 2

Second step : The probability of chossing one chocolate chp cookie in jar 1 is 3/5 and from the jar 2 is 1/2

Then the probability of Fred to get a chocolate chip cookie is

P ( get a chocolate chip cookie ) =( 0.5 * 3/5) +( 0.5* 1/2)

P = 0.3 + 0.25

P = 0.55   or  55 %

Answer: 68C2 = 2278

Step-by-step explanation:

Answer:

S=12+7D

Step-by-step explanation:

Linear relationships.

The initial amount of money Ethan has is $12. Each day, he adds up $7 to his savings. At a given day D after his initial funding, he will have added $7D, and he will have in his piggy bank

S=12+7D

For example, on the day D=30 he will have

S=12+7(30)=$222

Final answer:

To maximize the enclosed area, each pig pen should have a length of 84 feet and a width of 168 feet.

Explanation:

To find the dimensions of the pig pens that will maximize the enclosed area, we can use the quadratic formula. Let's assume the length of each pen is 'x' feet. Since the two pens share a common side, the combined length of the pens will be '2x' feet. The total length of the fencing, including both sides and the common side, will then be '2x' + 'x' + 'x' = '4x' feet.

According to the problem, the total length of the fencing is 336 feet. Therefore, we can write the equation '4x = 336'. To find the value of 'x', we divide both sides of the equation by 4: 'x = 84'.

So, each pen should have a length of 84 feet and a width of 2x the length, which is '2 × 84 = 168' feet.

Final Answer:

The dimensions for each pig pen that would yield the maximum enclosed area are 84 feet in length and 56 feet in width.

Explanation:

To solve this optimization problem, we can use calculus. Let's denote:
- The length of each pig pen by L
- The width of each pig pen by W
- The total amount of fencing by P, which is 336 feet

Since the two pig pens share a common side, the amount of fencing will be used for 3 widths and 2 lengths. So our perimeter constraint is:
3W + 2L = P

Since we know P is 336 feet, we can write this as:
3W + 2L = 336

We want to maximize the area, A, of the two pens combined. Since the two pens are adjacent and identical, this area can be represented by:
A = 2 * (L * W)

We want to maximize A with respect to our constraint.
First, let's express L in terms of W using our perimeter constraint:
2L = 336 - 3W
L = (336 - 3W) / 2

Now, we can express the area solely in terms of W:
A = 2 * (L * W)
A = 2 * ((336 - 3W) / 2 * W)
A = (336W - 3W^2)

To maximize A, we take the derivative of A with respect to W and set it to zero:
dA/dW = 336 - 6W

Setting dA/dW to zero gives us:
336 - 6W = 0
6W = 336
W = 336 / 6
W = 56

Now we have the width of each pig pen. Next, we'll use the value of W to find L:
L = (336 - 3W) / 2
L = (336 - 3 * 56) / 2
L = (336 - 168) / 2
L = 168 / 2
L = 84

So the dimensions of each rectangular pen that will maximize the area with 336 feet of fencing are:
- Length (L) = 84 feet
- Width (W) = 56 feet

We should verify this solution is a maximum by checking the second derivative of the area function:
d²A/dW² = -6

Since the second derivative is negative, our critical point W = 56 feet corresponds to a maximum. Therefore, the dimensions for each pig pen that would yield the maximum enclosed area are 84 feet in length and 56 feet in width.

Answer:

A) c(x)=1.50+1.25x

Step-by-step explanation:

The fixed rate (constant) is 1.50 and 1.25 (variable) depending on the number of additional nights, that is, c (x) = 1.25 (x) +1.50 =1.50+1.25x

the answer would be A

Answer:

t=5.20s

Step-by-step explanation:

I think that is the expression because it say he purchases two bags, all the bags are 5.20 so he brought two bags which are school bag and one hand bag the formula I used was y=mx+b but in these case I had to put t=5.20x. I hope this really helped you..

Answer:

Step-by-step explanation:

Anthony purchases two bags. The price of all bags is $5.20

Anthony purchases one school bag and one hand bag. It means that he purchased one handbag and one school bag for a total cost of $5.20

Let s represent the number of school bags and

Let h represent the number of hand bags.

An expression that represents the total cost,T, of the bag will be

T = s + h

Since total cost = $5.20

Then,

5.20 = s + h

Answer: Option 'd' is correct.

Step-by-step explanation:

Since we have given that

Researcher A :

Mean = 12.4

Standard deviation = 9

sample size = 30

So, the standard error is given by

[tex]\dfrac{\sigma}{\sqrt{n}}\\\\=\dfrac{9}{\sqrt{30}}\\\\=1.643[/tex]

Researcher B:

Mean = 12.4

Standard deviation = 9

Sample size = 40

So, the standard error is given by

[tex]\dfrac{\sigma}{\sqrt{n}}\\\\=\dfrac{9}{\sqrt{40}}\\\\=1.423[/tex]

Sample B has smaller standard error than sample A because the sample size was larger than A.

Hence, Option 'd' is correct.

Answer:

The length of the altitude is 9.3 yards and

The area of the triangle Δ UVW is 139.3 yd².

Step-by-step explanation:

Given

WU = 22 yd

WV = 30 yd

∠ UWV = 25°

To Find:

Altitude, UM = ?

area of the Δ UVW = ?

Construction:

Draw UM perpendicular to WV, that is altitude UM to WV.

Solution:

In right triangle Δ UWM if we apply Sine to angle W we get

[tex]\sin W = \frac{\textrm{side opposite to angle W}}{Hypotenuse}\\ \sin W=\frac{UM}{UW} \\[/tex]

substituting the values we get

[tex]\sin 25 = \frac{UM}{22}\\0.422 = \frac{UM}{22} \\UM = 0.422\times 22\\UM = 9.284\ yd[/tex]

Therefore, the altitude from U to WV is UM = 9.3 yd.(rounded to nearest tenth)

Now for area we have formula

[tex]\textrm{area of the triangle UVW} = \frac{1}{2}\times Base\times Altitude \\\textrm{area of the triangle UVW} = \frac{1}{2}\times VW \times UM\\=\frac{1}{2}\times 30\times 9.284\\ =139.26\ yd^{2}[/tex]

The area of the triangle Δ UVW is 139.3 yd². (rounded to nearest tenth)

Answer:

Remember, if B is a set, R is a relation in B and a is related with b (aRb or (a,b))

1. R is reflexive if for each element a∈B, aRa.

2. R is symmetric if satisfies that if aRb then bRa.

3. R is transitive if satisfies that if aRb and bRc then aRc.

Then, our set B is [tex]\{1,2,3,4\}[/tex].

a) We need to find a relation R reflexive and transitive that contain the relation [tex]R1=\{(1, 2), (1, 4), (3, 3), (4, 1)\}[/tex]

Then, we need:

1. That 1R1, 2R2, 3R3, 4R4 to the relation be reflexive and,

2. Observe that

Therefore [tex]\{(1,1),(2,2),(3,3),(4,4),(1,2),(1,4),(4,1),(4,2)\}[/tex] is the smallest relation containing the relation R1.

b) We need a new relation symmetric and transitive, then

and the analysis for be transitive is the same that we did in a).

Observe that

Therefore, the smallest relation containing R1 that is symmetric and transitive is

[tex]\{(1,1),(2,2),(3,3),(4,4),(1,2),(1,4),(2,1),(2,4),(3,3),(4,1),(4,2),(4,4)\}[/tex]

c) We need a new relation reflexive, symmetric and transitive containing R1.

For be reflexive

For be symmetric

For be transitive

Then, the smallest relation reflexive, symmetric and transitive containing R1 is

[tex]\{(1,1),(2,2),(3,3),(4,4),(1,2),(1,4),(2,1),(2,4),(3,3),(4,1),(4,2),(4,4)\}[/tex]

To find the smallest relation containing given pairs with specific properties, we add missing pairs and ensure all existing pairs satisfy the required properties.

a. To find the smallest relation that is reflexive and transitive, we need to add any missing pairs that would make the relation reflexive and ensure that all existing pairs satisfy the transitive property. In this case, the relation already contains (1, 2), (1, 4), (3, 3), and (4, 1). To make it reflexive, we add (2, 2) and (4, 4). To satisfy the transitive property, we need to add (1, 1), (2, 4), (3, 1), and (4, 2). Therefore, the smallest relation that is reflexive and transitive is {(1, 1), (1, 2), (1, 4), (2, 2), (2, 4), (3, 1), (3, 3), (4, 1), (4, 2), (4, 4)}.

b. To find the smallest relation that is symmetric and transitive, we need to add any missing pairs that would make the relation symmetric and ensure that all existing pairs satisfy the transitive property. In this case, the relation already contains (1, 2), (1, 4), (3, 3), and (4, 1). To make it symmetric, we need to add (2, 1) and (4, 4). To satisfy the transitive property, we need to add (1, 1), (2, 4), (3, 1), and (4, 2). Therefore, the smallest relation that is symmetric and transitive is {(1, 1), (1, 2), (1, 4), (2, 1), (2, 4), (3, 1), (3, 3), (4, 1), (4, 2), (4, 4)}.

c. To find the smallest relation that is reflexive, symmetric, and transitive, we need to add any missing pairs that would make the relation reflexive, symmetric, and ensure that all existing pairs satisfy the transitive property. In this case, the relation already contains (1, 2), (1, 4), (3, 3), and (4, 1). To make it reflexive, we add (2, 2) and (4, 4). To make it symmetric, we need to add (2, 1). To satisfy the transitive property, we need to add (1, 1), (2, 4), (3, 1), and (4, 2). Therefore, the smallest relation that is reflexive, symmetric, and transitive is {(1, 1), (1, 2), (1, 4), (2, 1), (2, 2), (2, 4), (3, 1), (3, 3), (4, 1), (4, 2), (4, 4)}.

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Answer:

Co-ordinates of point N is (3,-6)

Step-by-step explanation:

Given point:

Endpoint K(7,-2)

Mid-point of segment KN (5,-4)

Let endpoint [tex]N[/tex] have co-ordinates [tex](x_2,y_2)[/tex]

Using midpoint formula:

[tex]M=(\frac{x_1+x_2}{2},\frac{y_1+y_2}{2})[/tex]

Where [tex](x_1,y_1)[/tex] and [tex](x_2,y_2)[/tex] are co-ordinates of the endpoint of the segment.

Plugging in values to find the midpoint of segment KN.

[tex]M=(\frac{7+x_2}{2},\frac{-2+y_2}{2})[/tex]

We know [tex]M(5,-4)[/tex]

So, we have

[tex](5,-4)=(\frac{7+x_2}{2},\frac{-2+y_2}{2})[/tex]

Solving for [tex]x_2[/tex]

[tex]\frac{7+x_2}{2}=5[/tex]

Multiplying both sides by 2.

[tex]\frac{7+x_2}{2}\times 2=5\times 2[/tex]

[tex]7+x_2=10[/tex]

Subtracting both sides by 7.

[tex]7+x_2-7=10-7[/tex]

∴ [tex]x_2=3[/tex]

Solving for [tex]y_2[/tex]

[tex]\frac{-2+y_2}{2}=-4[/tex]

Multiplying both sides by 2.

[tex]\frac{-2+y_2}{2}\times 2=-4\times 2[/tex]

[tex]-2+y_2=-8[/tex]

Adding both sides by 2.

[tex]-2+y_2+2=-8+2[/tex]

∴ [tex]y_2=-6[/tex]

Thus co-ordinates of point N is (3,-6)

Question is Incomplete, Complete question is given below,

Murphy loves pistachio nuts. Every Saturday morning, she walks to the market and buys some. Last week, she bought two pounds and paid $7.96, and this week she bought only one-half pound and paid $1.99. What the unit rate for pistachio nuts?

Answer:

The unit rate for pistachio nuts is $3.98.

Step-by-step explanation:

Given;

Price of 2 pounds of pistachio nuts = $7.96

We need to find the price of 1 pound of pistachio nuts.

To find the same we will use the unitary method,

Hence ,

Price of 1 pound of pistachio nuts = [tex]\frac{\$7.96}{2} = \$3.98[/tex]

Also given:

Price of half pound of pistachio nuts = $1.99

We need to find the price of 1 pound of pistachio nuts.

To find the same we will use the unitary method,

Hence ,

Price of 1 pound of pistachio nuts = [tex]\$1.99\times 2 = \$3.98[/tex]

Hence, The unit rate for pistachio nuts is $3.98

Answer:

a one-unit increase

Step-by-step explanation:

In a simple regression model, the relationship between x and y can be represented by the equation y = ax+b, where

The slope term is the change in the mean value of y associated with a one-unit increase in x.

Answer:

  13x² -3x

Step-by-step explanation:

A horizontal line from the corner of the "notch" will divide the figure into two rectangles whose dimensions are given. The total area is the sum of the areas of those rectangles. Each area is the product of length and width.

  A = A1 + A2

  = x(3x-7) + 2x(5x+2)

  = 3x² -7x +10x² +4x

  = (3+10)x² +(-7+4)x

  = 13x² -3x

The area is 13x² -3x.

Answer:

B)$96.75

Step-by-step explanation:

5pound bag cost = $13.85

10pound bag cost= $20.43

25pound bag cost = $32.25

The least quantity of bag the customer can by is 65 pounds = (2*25 pound)+ 10 pound + 5pound = $98.78

But careful examination will show actually that since the most the customer can buy is 80 pound, then buying 25pound in three places give him even a lot cheaper than buying the least amount

75 pound = 3*25 pound = 32.25*3 = $96.75.

Therefore the least amount in cost the customer can buy is $96.75

Final answer:

Bob's consumer surplus after a tax is $4, and Lisa's is $1, making the total consumer surplus for both after the tax $5.

Explanation:

Consumer surplus is the difference between the value a consumer places on a good and what they actually pay. Before the government levies a tax, Bob's consumer surplus for a movie ticket is the difference between his valuation of $10 and the market price of $5, which is $5. Lisa's consumer surplus is the difference between her valuation of $7 and the market price of $5, which is $2.

After the government implements a $1 tax on movie tickets, increasing the price to $6, Bob's consumer surplus becomes $4 ($10 - $6), and Lisa's consumer surplus is now $1 ($7 - $6). Thus, the total consumer surplus for Bob and Lisa after the tax is implemented is $5 ($4 for Bob and $1 for Lisa).

Answer:

(-2, 2)

Step-by-step explanation:

Well first you would have to graph both inequalities.

y = mx + b

b is the y-axis intercept

m is the slope

Answer:

Maximum at [tex]x =\frac{\sqrt{7}}{3}[/tex]

Step-by-step explanation:

Given function,

[tex]f(x) = 14x - 6x^3[/tex]

Differentiating with respect to x,

[tex]f'(x) = 14 - 18x^2----(1)[/tex]

For critical values :

[tex]f'(x) = 0[/tex]

[tex]14 - 18x^2 =0[/tex]

[tex]14 = 18x^2[/tex]

[tex]x^2 = \frac{14}{18}[/tex]

[tex]x^2=\frac{7}{9}[/tex]

[tex]x = \pm \frac{\sqrt{7}}{3}[/tex]

Now, differentiating equation (1) again with respect to x,

[tex]f''(x) = -36x[/tex]

Since,

[tex]f''(\frac{\sqrt{7}}{3}) = -36(\frac{\sqrt{7}}{3}) < 0[/tex]

This means that the function is maximum at [tex]x=\frac{\sqrt{7}}{3}[/tex]

While,

[tex]f''(-\frac{\sqrt{7}}{3}) = 36(\frac{\sqrt{7}}{3}) > 0[/tex]

This means that the function is minimum at [tex]x=-\frac{\sqrt{7}}{3}[/tex]

Answer:

Associative analysis

Step-by-step explanation:

Associative analysis is an approach that is used to analyses the peoples mental representation , focusing on meaning and similarities and differences across the culture.It determined that relationship that is hidden in the large data set.It determine the relationship in between two variable as well.