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2 years ago

Please help and show work!! Will give brainliest!!

Mathematics

1 answer:

marin [14]2 years ago

4 0

With this one, since the problem says it will cost $35 per hour, then that will be based on the amount of hours spent on the job, so 35 gets the x, with x equaling the number of hours it took to do the job. $78 is the cost for a part so it is going to stay at 78. So your answer will be D. 35x+78≤225.

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Sharon pours 5 gallons of paint equally into 8 cans. How much paint is there in gallons

nydimaria [60]

Answer:

55.5 gallons is that

Step-by-step explanation:

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2 years ago

To estimate a proportion of students with a grade point average of 3.7 and higher in a college, a random sample of 200 students

VashaNatasha [74]

Answer: $(0.1481323,\ 0.2018677)$

Step-by-step explanation:

The confidence interval for population proportion :

$\hat{p}\pm z^*\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}$ , where n= sample size, $\hat{p}$ = sample proportion , z*= Critical z-value.

Let p = population proportion of successes.

Given: n= 200 , $\hat{p}=\dfrac{35}{200}=0.175$

Critical z value for 95% confidence = 1.96

The 95% confidence interval for a population proportion is:

$0.175\pm (1.96)\sqrt{\dfrac{(0.175)(1-0.175)}{200}}\\\\=\ 0.175\pm (1.96)\sqrt{0.000721875}\\\\= 0.175\pm (1.96)(0.0268677)\\\\=(0.175-0.0268677,0.175+0.0268677)\\\\= (0.1481323,\ 0.2018677)$

Required confidence interval: $(0.1481323,\ 0.2018677)$

3 0

2 years ago

7x-3y=21<br><br> Find the intercept

Cerrena [4.2K]

Y-intercept:

Plug in 0 for 'x' to find the y-intercept:

7x - 3y = 21

7(0) - 3y = 21

0 - 3y = 21

-3y = 21

Divide -3 to both sides:

y = -7

So the y-intercept is -7.

x-intercept:

7x - 3y = 21

Plug in 0 for 'y' to find the x-intercept.

7x - 3(0) = 21

7x - 0 = 21

7x = 21

Divide 7 to both sides:

x = 3

So the x-intercept is 3.

3 0

2 years ago

An 85-foot rope from the top of a tree house to the ground forms a 45 degree angle of elevation from the ground. How high is the

Feliz [49]

Answer:

$\boxed{h=60.1\ ft }$

Step-by-step explanation:

<u>Right Triangles </u>

They have a right angle (90°) and a longer side called the hypotenuse opposite to the right angle. The legs and the hyponetuse form two angles that must sum 90°, and they comply:

$\displaystyle sin\ \alpha=\frac {opp-leg}{hypotenuse}$

Where opp-leg is the opposite leg to $\alpha.$

The rope from the top of a tree house is 85-foot long. It's the hypotenuse (L) of the triangle it forms with the ground and the tree. The angle of 45° is opposite to the height of the tree (h).

$\displaystyle sin\ \alpha=\frac {h}{L}$

We can solve for h

$h=L\ sin\alpha =85\ sin\ 45^o$

$\boxed{h=60.1\ ft }$

6 0

2 years ago

In the algebraic expression 7/y, what is the coefficient of y? Explain

Alex777 [14]

7/y....the coefficient of y is 1

any time u have a variable by itself, whether it is x or y or any letter, the coefficient is gonna be 1

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3 years ago