Helpppp Number 9 pleaseeeee

Mathematics

1 answer:

RoseWind [281]3 years ago

4 0

17.6 bc if u multiply 55 and 8 u get 440 then divide that by 25, is 17.6 hope this helped?

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Buffy just put some money into a CD that pays 10.1% interest, compounded monthly. According to the rule of 72, in approximately

quester [9]

Let the principal be 'x' then the Amount will be 4x.

As the interest is compounded monthly:

Rate of interest = 10.1 % = 10.1/(100*12) = 0.101/12

Time = 12t

Amount = Principal[1 + Rate/100]

⇒ 4x = x[1 + 0.101/12]¹²t

⇒ 4x/x [1 + 0.008416667]¹²t

⇒ 4 = [1.008416667]¹²t

⇒ log(4) = log[1.008416667]¹²t

⇒ 0.602059991327 = [0.003640014891]¹²t

⇒ 12t = 0.602059991327/0.003640014891

⇒ 12t = 165.400419876

⇒ t = 165.400419876/12

t = 13.78 years or 13 years 9 months.

So, it is about 13 years 9 months she will have 4 times the amount of money.

5 0

3 years ago

Read 2 more answers

What would be the answer to this problem <img src="https://tex.z-dn.net/?f=%5Cfrac%7B7x-3%7D%7B9%7D%20%5Cgeq%208-2x" id="TexForm

Alenkasestr [34]

Answer:

$x\geq 3$

Step-by-step explanation:

6 0

3 years ago

A tour bus travels 2,160 miles in 36 hours. What is the average distance the bus travels in one hour?

Marysya12 [62]

60 miles in 1 hour (divide the miles by the hours)

5 0

2 years ago

Please help! I don't understand how to solve this problem

Ilia_Sergeevich [38]

Using the z-distribution, a sample of 142,282 should be taken, which is not practical as it is too large of a sample.

<h3>What is a z-distribution confidence interval?</h3>

The confidence interval is:

$\overline{x} \pm z\frac{\sigma}{\sqrt{n}}$

The margin of error is:

$M = z\frac{\sigma}{\sqrt{n}}$

In which:

$\overline{x}$ is the sample mean.

z is the critical value.

n is the sample size.

$\sigma$ is the standard deviation for the population.

Assuming an uniform distribution, the standard deviation is given by:

$S = \sqrt{\frac{(4 - 0)^2}{12}} = 1.1547$

In this problem, we have a 95% confidence level, hence $\alpha = 0.95$ , z is the value of Z that has a p-value of $\frac{1+0.95}{2} = 0.975$ , so the critical value is z = 1.96.