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4 years ago

PLEASE HELP ME!!!! ill mark 1st persons answer as brainliest

Mathematics

1 answer:

kari74 [83]4 years ago

7 0

$(x+2y)( x-5y) = \\ \\ x^2-5xy+2yx-10y^2= \boxed{x^2-3xy-10y^2} \to Step \ 4$

I wish you much success in your studies!!!!

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The water level in an ocean bay changes at an average rate at 3 meters per hour. at this rate, how many hours would it take for

11Alexandr11 [23.1K]

You can just do 12/3 which = 4.
Broken down you will see,
3m = 1hr
6m = 2hr
9m = 3hr
12m = 4hr
So the answer is 4hours

4 0

3 years ago

How to solve exponents with and equation

viva [34]

Exponents are hard but think about it like addition, that number tells you how many times to add that number to itself. To write the equation put the number and then the exponent on the top right of that number. Your welcome!

3 0

3 years ago

A professional volleyball player can jump an average of 2.5 times higher than the average person. If an average person can jump

nalin [4]

I = inches.
2.5*i= the answer

All I need to know is the actual number of inches so that i can give you the exact answer

8 0

4 years ago

A sample of 900 computer chips revealed that 61% of the chips fail in the first 1000 hours of their use. The company's promotion

Vlad [161]

Answer:

The p-value of the test is 0.0301 > 0.02, which means that there is not sufficient evidence at the 0.02 level to support the company's claim.

Step-by-step explanation:

The company's promotional literature claimed that under 64% fail in the first 1000 hours of their use.

At the null hypothesis, we test if the proportion is of at least 64%, that is:

$H_0: p \geq 0.64$

At the alternative hypothesis, we test if the proportion is of less than 64%, that is:

$H_1: p < 0.64$

The test statistic is:

$z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

In which X is the sample mean, $\mu$ is the value tested at the null hypothesis, $\sigma$ is the standard deviation and n is the size of the sample.

64% is tested at the null hypothesis:

This means that $\mu = 0.64, \sigma = \sqrt{0.64*0.36}$

A sample of 900 computer chips revealed that 61% of the chips fail in the first 1000 hours of their use.

This means that $n = 900, X = 0.61$

Value of the test statistic:

$z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

$z = \frac{0.61 - 0.64}{\frac{\sqrt{0.64*0.36}}{\sqrt{900}}}$

$z = -1.88$

P-value of the test and decision:

The p-value of the test is the probability of finding a sample proportion below 0.61, which is the p-value of z = -1.88.

Looking at the z-table, z = -1.88 has a p-value of 0.0301.

The p-value of the test is 0.0301 > 0.02, which means that there is not sufficient evidence at the 0.02 level to support the company's claim.

8 0

3 years ago

Name three fractions whose decimal equivalent is 0.40.draw a picture if it helps you explains

RideAnS [48]

0.40 is actually 2/5.

2/5=4/10=8/20=16/40

How did I create all of these fractions?

Quite simple... I multiplied each fraction by 1... What do you mean?

2/5*2/2=4/10

2/2 is one by the way.

4/10*2/2=8/20.

You get the idea?

5 0

3 years ago