Ask question

Ask question

All categories

3 years ago

14

A Painter painted about a fourth of a room in a fourth of a day. Coley estimated the painter would paint 7 rooms in 7 days. Is C

oleys estimate reasonable?

1 answer:

yKpoI14uk [10]3 years ago

4 0

Yes, it is reasonable. If a painter paints a fourth of a room in a fourth of a day, well that means in two-fourths of a day he would paint two-fourths of a room. Same for three fourths and four fourths, which is equal to one day. If he or she can paint one room in one day, it'd be reasonable to say that he can paint 7 rooms in 7 days.

You might be interested in

The touchdown to fumble ratio for Bobby Boucher was 9:2 If Bobby ran for 18 touchdowns,

Vika [28.1K]

Answer: He had 14 more touchdowns than he did fumbles.

Step-by-step explanation:

Step 1. Ok, so we need to see how many times 9 will divide into 18.

18/9=2.

Step 2. So now that we know that 9 goes into 18 two times and we know he has two fumbles for every 9 touchdowns we can multiply 2 by 2 to find out how man fumbles he had.

2*2=4

Step 3. Now to find out how many more touchdowns than fumbles he had we need to subtract his fumbles from his touchdowns.

18-4= 14. So, now we know he had 14 more touchdowns than he did fumbles.

Hope this helps!

4 0

3 years ago

What is C/a + 4 when a=2, and c= 10

tigry1 [53]

Answer:

4 and 10/2 so actually 9

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

Use trigonometry to find the missing side. Round your answer to the nearest tenth (one decimal place)

Alchen [17]

Given:

A figure of a right triangle.

To find:

The missing side by using the trigonometric ratios.

Solution:

In a right angle triangle,

$\cos \theta=\dfrac{Adjacent}{Hypotenuse}$

In triangle ABC,

$\cos A=\dfrac{AC}{AB}$

$\cos (31^\circ)=\dfrac{b}{270}$

$0.857=\dfrac{b}{270}$

Multiply both sides by 270.

$0.857\times 270=b$

$231.39=b$

$b\approx 231.4$

Therefore, the missing side length is b=231.4 inches.

5 0

3 years ago

Which one is it a b or c or d . ?

Svetach [21]

I think the answer is b

3 0

3 years ago

You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proporti

Ksenya-84 [330]

Answer:

We need a sample size of at least 369.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

For this problem, we have that:

$\pi = 0.32$

90% confidence level

So $\alpha = 0.1$ , z is the value of Z that has a pvalue of $1 - \frac{0.1}{2} = 0.95$ , so $Z = 1.645$ .

How large of a sample size is required?

We need a sample size of at least n.

n is found when $M = 0.04$ . So

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.04 = 1.645\sqrt{\frac{0.32*0.68}{n}}$

$0.04\sqrt{n} = 1.645\sqrt{0.32*0.68}$

$\sqrt{n} = \frac{1.645\sqrt{0.32*0.68}}{0.04}$

$(\sqrt{n})^{2} = (\frac{1.645\sqrt{0.32*0.68}}{0.04})^{2}$

$n = 368.02$

Rounding up

We need a sample size of at least 369.

5 0

3 years ago