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3 years ago

10

Please help and show work!

1 answer:

Ierofanga [76]3 years ago

8 0

Answer:

x = 3

Step-by-step explanation:

Two triangles are similar

x/(x+3) = 4/8 cross multiply expressions

8x = 4x + 12

8x - 4x = 12

4x = 12 divide both sides by 4

x = 3

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Please need help with this two problems

Julli [10]

I think it is 3 maybe

8 0

3 years ago

Read 2 more answers

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

4 years ago

The price of a video game was reduced from $60 to $45. By what percentage was the price of the Vedic games reduced.

riadik2000 [5.3K]

Answer:

$33.3\%$

Step-by-step explanation:

Given: price of a video game was reduced from $\$60$ to $\$45$

To find: percentage decrease in the price of the Vedic games

Solution:

Old price of the game $=\$60$

New price of the game $=\$45$

Decrease in the price of the Vedic games $=\$60-\$45=\$15$

Percentage decrease in the price of the Vedic games = (Decrease in the price of the Vedic games × 100) ÷ New price of the game

$=\frac{15(100)}{45} =\frac{100}{3}\%=33.3\%$

6 0

3 years ago

Please help me please

sveticcg [70]

Answer:

idk

Step-by-step explanation:

7 0

3 years ago

Help!!!! 20 points!!!!!!’

Gnoma [55]

Answer:

option c is the correct answer

first take y raised to the power 4 common then cancel its power by y raised to the power 3

you get your answer

3 0

3 years ago