A baseball team plays in a stadium that holds 55,000 spectators. With ticket prices at , the average attendance had been 27,000. When ticket prices were lowered to , the average attendance rose to 33,000. (a) Find the demand function, assuming that it is linear. (b) How should ticket prices be set to maximize revenue?

Answer:

a) 0.3277

b) 0.0128

Step-by-step explanation:

We are given the following information in the question:

N(2750, 560).

Mean, μ = 2750

Standard Deviation, σ = 560

We are given that the distribution of distribution of birth weights is a bell shaped distribution that is a normal distribution.

Formula:

[tex]z_{score} = \displaystyle\frac{x-\mu}{\sigma}[/tex]

a) P (less than 2500 grams)

P(x < 2500)

[tex]P( x < 2500) = P( z < \displaystyle\frac{2500 - 2750}{560}) = P(z < -0.4464)[/tex]

Calculation the value from standard normal z table, we have,  

[tex]P(x < 2500) = P(z < -0.4464) = 0.3277 = 32.77\%[/tex]

b) P ((less than 1500 grams)

P(x < 1500)

[tex]P( x < 1500) = P( z < \displaystyle\frac{1500 - 2750}{560}) = P(z < -2.2321)[/tex]

Calculation the value from standard normal z table, we have,  

[tex]P(x < 1500) = P(z < -2.2321) = 0.0128 = 1.28\%[/tex]

Final answer:

The probability of a late-preterm baby having a low birth weight (< 2500 grams) is approximately 32.74%, and the probability of a very low birth weight (< 1500 grams) is about 1.29%.

Explanation:

To answer the given questions, we will use the properties of the normal distribution, where the mean birth weight (μ) for late-preterm babies is 2750 grams, and the standard deviation (σ) is 560 grams. The distribution of birth weights is assumed to be normal (N(2750, 560)).

1. Probability of a Low Birth Weight (< 2500 grams)

To find the probability of a baby having a low birth weight (less than 2500 grams), we use the Z-score formula: Z = (X - μ) / σ, where X is the value of interest (2500 grams). Plugging in the values gives us Z = (2500 - 2750) / 560 = -0.4464. Using a Z-table or a normal distribution calculator, we find the probability corresponding to Z = -0.4464, which is approximately 0.3274. Therefore, the probability of a late-preterm baby having a low birth weight is about 0.3274 or 32.74%.

2. Probability of a Very Low Birth Weight (< 1500 grams)

To calculate the probability of a very low birth weight (less than 1500 grams), again we calculate the Z-score: Z = (1500 - 2750) / 560 = -2.2321. The probability of Z = -2.2321, referring to the Z-table or calculator, is extremely low, approximately 0.0129 or 1.29%. This indicates that the chances of a late-preterm baby having a very low birth weight is about 1.29%.

Answer:

0.7 is the probability that a randomly selected person either has high blood pressure or is a runner or both.

Step-by-step explanation:

We are given the following information in the question:

Probability that a randomly selected person has high blood pressure = 0.4

[tex]P(H) = 0.4[/tex]

Probability that a randomly selected person is a runner = 0.4

[tex]P(R) = 0.4[/tex]

Probability that a randomly selected person has high blood pressure and is a runner = 0.1

[tex]P(H \cap R) = 0.1[/tex]

If the events of selecting a person with high blood pressure and person who is a runner are independent then we can write:

[tex]P(H \cup R) = P(H) + P(R)-P(H\cap R)[/tex]

Probability that a randomly selected person either has high blood pressure or is a runner or both =

[tex]P(H \cup R) = P(H) + P(R)-P(H\cap R)\\P(H \cup R) = 0.4 + 0.4 -0.1 = 0.7[/tex]

0.7 is the probability that a randomly selected person either has high blood pressure or is a runner or both.

Final answer:

The probability that a randomly selected person either has high blood pressure or is a runner or both is 0.7.

Explanation:

To find the probability that a randomly selected person either has high blood pressure or is a runner or both, we use the formula for the probability of either event A or event B occurring, which is:

P(A or B) = P(A) + P(B) - P(A and B).

Given:

P(H) = probability of high blood pressure = 0.4

P(R) = probability of being a runner = 0.4

P(H and R) = probability of both high blood pressure and being a runner = 0.1

Using the formula, we plug in the given probabilities:

P(H or R) = 0.4 + 0.4 - 0.1 = 0.7.

So, the probability that a randomly selected person either has high blood pressure, is a runner, or both events occur is 0.7.

Answer:

d. 29ft

Step-by-step explanation:

Using pythagoras theorem which states that

a^2 + b^2 = c^2

where a and b are the opposite and adjacent sides of a right angled triangle and c is the hypotenuse side

From the attached image, Let the length of the rope be x

[tex]x^{2} = 8^{2}+ 28^{2} \\[/tex]

[tex]x^{2} = 64 + 784[/tex]

[tex]x^{2} = 848[/tex]

[tex]x =\sqrt{848}[/tex]

[tex]x = 29.12[/tex]

x≈29

Answer:

b. Exactly two outcomes are possible on each trial.

Step-by-step explanation:

The correct answer is option B: Exactly two outcomes are possible on each trial.

We can define the binomial probability in any binomial experiment, as the probability of getting exactly x successes for n repeated trials, that can have 2 possible outcomes.

The binomial probability distribution is applicable when an experiment has exactly two outcomes. These trials are independent and the probabilities of the outcomes remain the same for each trial, referred to as Bernoulli trials. Using this distribution, we can calculate mean and standard deviation for the function.

The characteristic of an experiment where the binomial probability distribution is applicable is when exactly two outcomes are possible on each trial, referred to as 'success' and 'failure.' These are termed as Bernoulli trials for which binomial distribution is observed. In this situation, 'p' denotes the probability of a success on one trial, while 'q' represents the failure likelihood. The trials are independent, which means the outcome of one trial does not affect the results of subsequent trials. Moreover, the probabilities of the outcomes remain constant for every trial. The random variable X signifies the number of successes in these 'n' independent trials. The mean and standard deviation can be calculated using the formulas µ = np and √npq, respectively.

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Answer:

Step-by-step explanation:

The population P of a certain city can be modeled by

P=19000e0.0215t

where T represent the number of years since 2000.

When t=1 the year is 2001

when t =2 the year is 2002. This means that

When t=0 the year is 2000

To determine the year when the population will be 40,000 , we will substitute P = 40,000 and solve for t. It becomes

40000 = 19000e^0.0215t

40000 / 19000 = e^0.0215t

2.105 = e^0.0215t

Take ln of both sides

0.7443 = 0.0215t

t = 0.7443/0.0215

t = 34.62

Approximately 35 years

So the year will be 2035

Answer:

The answer to your question is: Burger = $4.45, Pizza = $2.2

Step-by-step explanation:

Jason = $15.5 for 3 slices of pizza + 2 burgers

Susan = $20 for 1 slice of pizza + 4 burgers

Pizza = p

burger = b

System of equations

Jason                                   3p + 2b = 15.5        (I)

Susan                                     p + 4b = 20           (II)

Solve system by elimination

Multiply (II) by -3

                                          3p + 2b = 15.5

                                        -3p - 12b = -60

                                              -10b = -44.5

                                                   b = -44.5/-10

                                                  b = $4.45

                                             p + 4(4.45) = 20

                                             p + 17.8 = 20

                                             p = 20 - 17.8

                                                 p = 2.2

One slice of pizza costs $2.2 and one burger cost $4.45

Answer:

The answer to your question is letter A. [tex]\frac{8}{17}[/tex]

Step-by-step explanation:

Sin C = [tex]\frac{opposite side }{hypotenuse}[/tex]

Opposite side = 8

hypotenuse = 17

Substitution and result

sin C= [tex]\frac{8}{17}[/tex]

He has a 26% of getting a strike, which means he has a 74% chance of not getting a strike ( 100% - 26% = 74%).

Multiply the chance of not getting a strike by the number of attempts:

0.74 x 0.74 x 0.74 x 0.74 x 0.74 = 0.22

The answer is B) 0.22

The probability of making a free throw is 77%, the probability of not making one would be 23% ( 100% - 77% = 23%).

Add the probability of making the first one ( 0.77) by the probability of making the second one multiplied by the probability of missing the second one ( 0.77x 0.23)

0.77 + (0.77 x 0.23)

0.77 + 0.18 = 0.95

The answer is D) 95%

Final answer:

To find the probability that Keyshawn doesn't get a strike until after his first five attempts, we need to find the probability of him not getting a strike on each individual attempt. The probability that Keyshawn doesn't get a strike until after his first five attempts is 0.19. To find the probability that Coram makes his first free throw within his first two shots, we need to find the probability of him making a free throw on the first or the second shot. The probability that Coram makes his first free throw within his first two shots is 95%.

Explanation:

To find the probability that Keyshawn doesn't get a strike until after his first five attempts, we need to find the probability of him not getting a strike on each individual attempt. Since each attempt is independent, we can multiply the probabilities together.

The probability of him not getting a strike on each attempt is 1 - 0.26 (the probability of getting a strike). So the probability of not getting a strike on the first five attempts is (1 - 0.26) * (1 - 0.26) * (1 - 0.26) * (1 - 0.26) * (1 - 0.26).

Calculating this expression, we get:

(0.74) * (0.74) * (0.74) * (0.74) * (0.74) = 0.192.

So the probability that Keyshawn doesn't get a strike until after his first five attempts is approximately 0.192.

Therefore, the correct answer is A) 0.19.

To find the probability that Coram makes his first free throw within his first two shots, we need to find the probability of him making a free throw on the first or the second shot. These events are mutually exclusive, so we can add the probabilities together.

The probability of him making a free throw on the first shot is 0.77, and the probability of him missing the first shot and making a free throw on the second shot is (1 - 0.77) * 0.77. So the total probability is 0.77 + (1 - 0.77) * 0.77.

Calculating this expression, we get:

0.77 + 0.23 * 0.77 = 0.77 + 0.1771 = 0.9471.

So the probability that Coram makes his first free throw within his first two shots is approximately 0.9471.

Therefore, the correct answer is D) 95%.

Answer:

There were 333 seniors in 1990

153 seniors had jobs in 2010.

Step-by-step explanation:

Let the number of high school seniors in 1990 = x

75% of x had jobs in 1990

In 2010 there were 50 more seniors. That is, the number of seniors is x+50.

40% of (x+50) had jobs in 2010.

Total number of jobs in both years = 403.

\[0.75 * x + 0.4 * (x + 50) = 403\]

\[0.75 * x + 0.4 * x  + 20 = 403\]

=> \[1.15 * x  = 403 - 20\]

=> \[1.15 * x  = 383\]

=> \[x  = 383/1.15\]

=> \[x  = 333\]

Number of seniors having job in 2010 = 0.4 * (333 + 50) = 0.4 * 383 = 153.2 = 153(approx)

The speed is 66.33 miles per hour

Step-by-step explanation:

Given

Total distance = 325 miles

They still have 126 miles to go. In order to find the distance they have covered, we will subtract the remaining miles from the total

So,

[tex]Distance\ covered=325-126=199\ miles[/tex]

the car has been driving for 3 hours

So,

t= 3 hours

d = 199 miles

[tex]Speed=\frac{d}{t}\\=\frac{199}{3}\\=66.33\ miles\ per\ hour[/tex]

The speed is 66.33 miles per hour

Keywords: Speed, Distance

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Answer:

x = 1

y = -4

Step-by-step explanation:

We will multiply the 2nd equation by 4 first:

4 * [-x + y = -5]

-4x + 4y = -20

Now we will add this equation with 1st equation given. Shown below:

4x + 3y = -8

-4x + 4y = -20

---------------------

7y = -28

Now, we can solve for y easily:

7y = -28

y = -28/7

y = -4

Now, we take this value of y and put it in 1st original equation and solve for x:

4x + 3y = -8

4x + 3(-4) = -8

4x - 12 = -8

4x = -8 + 12

4x = 4

x = 4/4

x = 1

So, this is the only solution to this problem ( 1 intersection point at x = 1 and y = -4)

Answer:

The number of ways the license plates contain no repeated letters and no repeated digits = 1,404,000

Step-by-step explanation:

The total number of alphabet's = 26

The total number of digits  = 10 (0 - 9)

The number plate contains 3 letters followed by 2 digits.

The number of ways the license plates contain no repeated letters and no repeated digits.

The number of ways first letter can be filled in 26 ways.

The number of ways second letter can be filled in 25 ways.

The number of ways third letter can be filled in 24 ways.

The number of ways the first digit can be in 10 ways

The number of ways the second digit can be in 9 ways.

The number of ways the license plates contain no repeated letters and no repeated digits = 26 × 25 × 24 × 1 0 × 9

The number of ways the license plates contain no repeated letters and no repeated digits = 1,404,000

The coffee's temperature after 15 minutes in the freezer, using Newton's Law of Cooling with a cooling constant [tex]\( k \approx 0.0816 \),[/tex] is approximately [tex]\( 45.57^\circ F \).[/tex]

Newton's Law of Cooling is given by the equation:

[tex]\[ T(t) = T_a + (T_0 - T_a) \cdot e^{-kt} \][/tex]

Where:

[tex]\( T(t) \)[/tex]= temperature of the object at time \( t \)

[tex]\( T_0 \)[/tex] = initial temperature of the object

[tex]\( T_a \)[/tex] = ambient temperature

[tex]\( k \)[/tex] = cooling constant

[tex]\( t \)[/tex] = time

Given:

[tex]\( T_0 = 155^\circ F \)[/tex] (initial temperature)

[tex]\( T_a = 0^\circ F \)[/tex] (ambient temperature)

[tex]\( T(5) = 103^\circ F \)[/tex](temperature after 5 minutes)

We need to find the coffee's temperature[tex](\( T(15) \))[/tex] after 15 minutes. First, we need to determine the cooling constant [tex]\( k \)[/tex].

Using the given information, let's rearrange Newton's Law of Cooling to solve for [tex]\( k \)[/tex]:

[tex]\[ T(t) = T_a + (T_0 - T_a) \cdot e^{-kt} \][/tex]

[tex]\[ T(t) - T_a = (T_0 - T_a) \cdot e^{-kt} \][/tex]

[tex]\[ \frac{T(t) - T_a}{T_0 - T_a} = e^{-kt} \][/tex]

[tex]\[ -kt = \ln\left(\frac{T(t) - T_a}{T_0 - T_a}\right) \][/tex]

[tex]\[ k = -\frac{1}{t} \cdot \ln\left(\frac{T(t) - T_a}{T_0 - T_a}\right) \][/tex]

Given [tex]\( T(5) = 103^\circ F \)[/tex]:

[tex]\[ k = -\frac{1}{5} \cdot \ln\left(\frac{103 - 0}{155 - 0}\right) \][/tex]

[tex]\[ k = -\frac{1}{5} \cdot \ln\left(\frac{103}{155}\right) \][/tex]

[tex]\[ k \approx -\frac{1}{5} \cdot \ln(0.6645) \][/tex]

[tex]\[ k \approx -\frac{1}{5} \cdot (-0.4081) \][/tex]

[tex]\[ k \approx 0.0816 \][/tex]

Now that we have the cooling constant [tex]\( k \)[/tex], we can find [tex]\( T(15) \)[/tex]:

[tex]\[ T(15) = T_a + (T_0 - T_a) \cdot e^{-kt} \][/tex]

[tex]\[ T(15) = 0 + (155 - 0) \cdot e^{-0.0816 \cdot 15} \][/tex]

[tex]\[ T(15) = 155 \cdot e^{-1.224} \][/tex]

[tex]\[ T(15) \approx 155 \cdot 0.294 \][/tex]

[tex]\[ T(15) \approx 45.57^\circ F \][/tex]

Therefore, the coffee's temperature after 15 minutes in the freezer is approximately [tex]\( 45.57^\circ F \)[/tex].

Answer:

C

Step-by-step explanation:

2x²-4x=0

2x(x-2)=0

either x=0

or x-2=0

x=2

so x=0,2

Answer:

Remember, a homogeneous system always is consistent. Then we can reason with the rank of the matrix.

If the system Ax=0 has only the trivial solution that's mean that the echelon form of A hasn't free variables, therefore each column of the matrix has a pivot.

Since each column has a pivot then we can form the reduced echelon form of the A, and leave each pivot as 1 and the others components of the column will be zero. This means that the reduced echelon form of A is the identity matrix and so on A is row equivalent to identity matrix.

Answer:

f(x) = ln(x^3 + e^4x) answer is explain in attachment .

Step-by-step explanation:

f(x) = ln(x^3 + e^4x) =(2x+3e³ˣ) 1/x² + e³ˣ

Answer:

  1

Step-by-step explanation:

(f+g)(1) = f(1) +g(1) = -1 + 2 = 1

__

The pair (1, -1) in the definition of f tells you f(1) = -1.

The pair (1, 2) in the definition of g tells you g(1) = 2.

The real zeroes of given function is [tex]-\frac{3}{2},-1, \text { and } 2[/tex]

Given that, [tex]f(x)=2 x^{3}+x^{2}-7 x-6[/tex]

We have to find the real and imaginary zeroes

This can be found out by equating the function to zero and finding the roots "x"

Now, let us use trail and error method.

So put x = 1 in f(x)

f(1) = 2 + 1 – 7 – 6 = - 10  

1 is not a root.  Since f(1) is not equal to 0

Now put x = -1

f(-1) = -2 + 1 + 7 – 6 = 0  

-1 is a root.  Since f(-1) is equal to 0

So, one of the roots is -1. Let the other roots be a, b.

[tex]\text { Sum of roots }=\frac{-x^{2} \text { coefficient }}{x^{3} \text { coefficient }}[/tex]

[tex]\begin{array}{l}{a+b+(-1)=\frac{-1}{2}} \\\\ {a+b=1-\frac{1}{2}} \\\\ {a+b=\frac{1}{2} \rightarrow(1)}\end{array}[/tex]

[tex]\begin{array}{l}{\text {Product of roots }=\frac{-\text {constant}}{x^{3} \text {coefficient}}} \\\\ {a b(-1)=\frac{-(-6)}{2}} \\\\ {a b(-1)=3} \\\\ {a b=-3 \rightarrow(2)}\end{array}[/tex]

Now, we know that, algebraic identity,

[tex]\begin{array}{l}{(a-b)^{2}=(a+b)^{2}-4 a b} \\\\ {(a-b)^2=\left(\frac{1}{2}\right)^{2}-4(-3)} \\\\ {(a-b)^2=\frac{1}{4}+12} \\\\ {(a-b)^2=\frac{49}{4}} \\\\ {a-b=\frac{7}{2} \rightarrow(3)}\end{array}[/tex]

Add (1) and (3)

[tex]\begin{array}{l}{2 a=\frac{7+1}{2} \rightarrow 2 a=4 \rightarrow a=2} \\\\ {\text { Then, from }(2) \rightarrow b=-\frac{3}{2}}\end{array}[/tex]

Hence, the roots of the given equation are [tex]-\frac{3}{2},-1, \text { and } 2[/tex]

Answer:each pound of jelly beans cost $2.5

Each pound of trailmix cost $1.25

Step-by-step explanation:

Let x represent the cost of one pound of jelly bean.

Let y represent the cost of one pound of trail mix.

A stores having a sale on jelly beans and trail mix for 8 pounds of jelly beans and 4 pounds of trail mix the total cost is $25. This means that

8x + 4y = 25 - - - - - - -1

For 3 pounds of jelly beans and 2 pounds of trailmix the total cost is $10. This means that

3x + 2y = 10 - - - - - - - - 2

Multiplying equation 1 by 3 and equation 2 by 8, it becomes

24x + 12y = 75

24x + 16y = 80

Subtracting,

- 4y = -5

y = - 5/ -4 = 1.25

Substituting y = 1.25 into equation 2, it becomes

3x + 2×1.25 = 10

3x + 2.5 = 10

3x = 10 - 2.5 = 7.5

x = 7.5/3 = 2.5

Answer:

Their intercepts are unique.

Explanation:

[tex]\displaystyle x^3 - 24x^2 + 192x - 508 = (x - 8)^3 + 4[/tex]

This graph's x-intercept is located at approximately [6,41259894, 0], and the y-intercept located at [0, −508].

[tex]\displaystyle g(x) = x^3[/tex]

The parent graph here, has both an x-intercept and y-intercept located at the origin.

I am joyous to assist you anytime.

The plot is missing. I have written the stem-leaf plot below.

Answer:

(a) 35 participants

(b) 22 participants traveled more than 14 km.

Step-by-step explanation:

Given:

(a)

The stem-leaf plot is given as:

12| 3  3  6 7 9 9

13| 1 1 4 5 5

14| 0 0 2 3 3 8 8 9

15| 2 2 2 2 2 3 5 5 7

16| 4 5 5 9 9

17| 3 5

The total number of numbers on the leaf side gives the total number of participants.

So, the number of participants is equal to the total number of elements on the leaf part. The total number of elements on the leaf part is 35.

Therefore, the total number of participants is 35.

(b)

Given:

12| 3  3   6 7 9 9

13| 1 1 4 5 5

14| 0 0 2 3 3 8 8 9

15| 2 2 2 2 2 3 5 5 7

16| 4 5 5 9 9

17| 3 5

One element of the stem part and one part of leaf part is represented as:

12 | 3 means 12.3 km

So, the number of walkers traveling more than 14.0 km is the list of all numbers greater than 14.0 km. Let us write all the numbers which are greater than 14.0 km. The numbers are:

14 | 2 3 3 8 8 9 = 6 participants

15 | 2 2 2 2 2 3 5 5 7 = 9 participants

16 | 4 5 5 9 9 = 5 participants

17 | 3 5 = 2 participants

Therefore, the total number is the sum of all the above which is equal to:

= 6 + 9 + 5 + 2 = 22 participants

Answer:

C. 2x^2-7x+7

Step-by-step explanation:

(3x^2-2x+2)-(x^2+5x-5)     Given

From the given you will subtract like terms from both parenthesis.

3x^2-x^2=2x^2

-2x-5x=-7x

2-(-5)=7                      

To simplify the given expression, distribute the negative sign through the second parentheses, combine like-terms, which results in 2x^2 - 7x + 7, corresponding to option (c).

To simplify the expression (3x2−2x+2)−(x2+5x−5), you'd start by distributing the negative sign through the second parentheses.

Doing so gives us 3x^2 - 2x + 2 - x^2 - 5x + 5.

Upon combining like-terms, the expression becomes 2x^2 - 7x + 7.

So, the simplified form of the original expression is 2x^2 - 7x + 7.

In the given options,

c) 2x²-7x+7 is right

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Answer:

c

Step-by-step explanation:

Answer:

See the answers bellow

Step-by-step explanation:

For 51:

Using the definition of funcion, given f(x) we know that different x MUST give us different images. If we have two different values of x that arrive to the same f(x) this is not a function. So, the pair (-4, 1) will lead to something that is not a funcion as this would imply that the image of -4 is 1, it is, f(-4)=1 but as we see in the table f(-4)=2. So, as the same x, -4, gives us tw different images, this is not a function.

For 52:

Here we select the three equations that include a y value that are 1, 3 and 4. The other values do not have a y value, so if we operate we will have the value of x equal to a number but not in relation to y.

For 53:

As he will spend $10 dollars on shipping, so he has $110 for buying bulbs. As every bulb costs $20 and he cannot buy parts of a bulb (this is saying you that the domain is in integers) he will, at maximum, buy 5 bulbs at a cost of $100, with $10 resting. He can not buy 6 bulbs and with this $10 is impossible to buy 0.5 bulbs. So, the domain is in integers from 1 <= n <= 5. Option 4.

For 54:

As the u values are integers from 8 to 12, having only 5 possible values, the domain of the function will also have only five integers values, With this we can eliminate options 1 and 2 as they are in real numbers. Option C is the set of values for u but not the domain of c(u). Finally, we have that 4 is correct, those are the values you have if you replace the integer values from 8 to 12 in c(u). Option 4.

Answer:

The hikers are 5.9 miles apart.

Step-by-step explanation:

Let O represents the base camp,

Suppose after walking 3.5 miles west, first hiker's position is A, then after going 1.5 miles north from A his final position is B,

Similarly, after walking 2 miles east, second hiker's position is C then going towards 0.5 miles south his final position is D.

By making the diagram of this situation,

Let D' is the point in the line AB,

Such that, AD' = CD

In triangle BD'D,

BD' = AB + AD' = 1.5 + 0.5 = 2 miles,

DD' = AC = AO + OC = 3.5 + 2 = 5.5 miles,

By Pythagoras theorem,

[tex]BD^2 = BD'^2 + DD'^2[/tex]

[tex]BD = \sqrt{2^2 + 5.5^2}=\sqrt{4+30.25}=\sqrt{34.25}\approx 5.9[/tex]

Hence, the hikers are 5.9 miles apart.

There are 4 people in Molly's group.

Step-by-step explanation:

Let,

x be the number of people.

Individual ticket price = $42

Price after discount = $30

Discount per ticket = $3

Discount for x people = 3x

According to given statement;

42-3x=30  

Subtracting 42 from both sides

[tex]42-42-3x=30-42\\-3x=-12\\[/tex]

Dividing both sides by -3

[tex]\frac{-3x}{-3}=\frac{-12}{-3}\\x=4[/tex]

There are 4 people in Molly's group.

Keywords: Subtraction, division

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#LearnwithBrainly

Answer:

he age of girl 3 [tex]\frac{1}{2}[/tex] years ago is 8.5 years  .

Step-by-step explanation:

Given as :

The present age of seventh grader girl = 12 years

Let The age of her 3 [tex]\frac{1}{2}[/tex] years ago = x years

So The age of girl [tex]\frac{7}{2}[/tex] years ago = x years

Now, According to question

The age of girl 3.5 years ago = 12 - 3.5

Or,  The age of girl 3.5 years ago = 8.5 years

Hence The age of girl 3 [tex]\frac{1}{2}[/tex] years ago is 8.5 years  . Answer

Answer:the cost of renting one movie is $1.5

the cost of renting one video game is $5.2

Step-by-step explanation:

Let x represent the cost of renting one movie.

Let y represent the cost of renting one video game. One month melissa rented 12 movies and 2 video games for a total of $29. This means that

12x + 2y = 29 - - - - - - -1

The next month she rented 3 movies and 5 video games for a total of 32$. This means that

3x + 5y = 32 - - - - - - - - 2

Multiplying equation 1 by 5 and equation 2 by 2, it becomes

60x + 10y = 145

6x + 10y = 64

Subtracting,

54x = 81

x = 81/54 = 1.5

Substituting x = 1.5 into equation 2, it becomes

3x + 5y = 32

3×2 + 5y = 32

5y = 32 - 6 = 26

y = 26/5 = 5.2