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4 years ago

I attached the picture please help!

Mathematics

1 answer:

zzz [600]4 years ago

7 0

Answer:

29 Minutes

Step-by-step explanation:

To Solve The First Step of The Equation, You Need To Solve For 25x20/100.

Your answer will be five. To simplify, think 25 percent of 100. 25 can go into 100 four times, therefore 5 can go into 20 four times. Marcus Spent 5 minutes on soccer the first day.

For the second part, use the same equation. 40x60/100. You should get 24, so Marcus practiced 24 minutes the next day.

Add the two together, and you should get 29.

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Smith Automotive needs to hire a new mechanic. They decide to place an

zloy xaker [14]

Answer:

y = 45 + 5(x - 5)

where y is the total cost of the ad, and x is the total number of lines in the ad

Step-by-step explanation:

Let x = number of lines in the ad

Let y = total cost

If the cost of the ad is $45 for the first 5 lines and $5 for each additional line then the expression for the total cost of the ad is:

y = 45 + 5(x - 5)

6 0

2 years ago

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Jonah wants to construct a confidence interval using 90% confidence to estimate what proportion of silicon wafers at his factory

Nimfa-mama [501]

Answer:

170

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 of:

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

Assume:

$\pi = 0.06$

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 $Z = 1.645$ .

What is the smallest sample size required to obtain the desired margin of error?

This is n for which M = 0.03. So

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

$0.03 = 1.645\sqrt{\frac{0.06*0.94}{n}}$

$0.03\sqrt{n} = 1.645\sqrt{0.06*0.94}$

$\sqrt{n} = \frac{1.645\sqrt{0.06*0.94}}{0.03}$

$(\sqrt{n})^2 = (\frac{1.645\sqrt{0.06*0.94}}{0.03})^2$

$n = 169.6$

Rounding up, 170.

4 0

3 years ago

if u are really good at algebra and two way frequency tables please let me know i need some help on 3 questions.

pashok25 [27]

Ya, can't help if you don't show the questions.

6 0

4 years ago

Here are two rectangles. The table below represents some values for $$ and $$ such that the areas of the rectangles sum to $$ cm

raketka [301]

The area of the first rectangle would be 18cm² and the area of the second rectangle would be 12cm².

<h3>How to calculate the area of a rectangle?</h3>

To calculate the area of a rectangle we must apply the following mathematical formula:

Side × base = area

According to the above, to calculate the area of the rectangles we must multiply the length of the side by the base as shown below. We must also take into account the table that will give us the value of X that we do not know:

3cm × 6cm = 18cm²
2cm × 6cm = 12cm²

Finally, to know how much the area of both rectangles adds up, we add both values:

12cm² + 18cm² = 30cm²

Note: This question is incomplete because the graph is missing. Here is the graph

Learn more about rectangles in: brainly.com/question/10046743

3 0

2 years ago

What is 90% of 130 inches ?

Dafna11 [192]

117 is the correct answer. Hope this helps!

8 0

4 years ago

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