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tino4ka555 [31]
3 years ago
10

2/3x=10 help please and explain

Mathematics
2 answers:
mixer [17]3 years ago
5 0
<span>\frac{2}{3x}=10
</span><span>Multiply both sides by 3x:
2=30x
</span>Divide both sides by 30:
\frac{2}{30}=x
Simplify:
x=\frac{1}{15}
Check:
<span>\frac{2}{3\times\frac{1}{15}}=10
</span><span>\frac{2}{\frac{3}{15}}=10
</span>\frac{15\times2}{3}=10
\frac{30}{3}=10
10=10
stira [4]3 years ago
3 0
 Solutions 

Simplify <span><span>2/3</span>x</span> to <span><span>2x/</span>3
</span>
<span><span><span>2x/</span>3</span>=10

</span>2) Multiply both sides by 3

<span>2x=10×3

3) </span>Simplify 10×3 to 30

<span>2x=30

4) </span>Divide both sides by <span>2

</span><span>x=30 </span>÷ <span>2

5) </span>Simplify <span>30 </span><span>÷ 2</span><span> </span><span>to</span><span> </span><span>15

</span><span><span>x=15

Answer = 15  

Also can be written as 1/15</span></span>
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The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in t
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Answer:

The test statistic is c. 2.00

The p-value is a. 0.0456

At the 5% level, you b. reject the null hypothesis

Step-by-step explanation:

We want to test to determine whether or not the mean waiting time of all customers is significantly different than 3 minutes.

This means that the mean and the alternate hypothesis are:

Null: H_{0} = 3

Alternate: H_{a} = 3

The test-statistic is given by:

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.

Sample of 100 customers.

This means that n = 100

3 tested at the null hypothesis

This means that \mu = 3

The average length of time it took the customers in the sample to check out was 3.1 minutes.

This means that X = 3.1

The population standard deviation is known at 0.5 minutes.

This means that \sigma = 0.5

Value of the test-statistic:

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

z = \frac{3.1 - 3}{\frac{0.5}{\sqrt{100}}}

z = 2

The test statistic is z = 2.

The p-value is

Mean different than 3, so the pvalue is 2 multiplied by 1 subtracted by the pvalue of Z when z = 2.

z = 2 has a pvalue of 0.9772

2*(1 - 0.9772) = 2*0.0228 = 0.0456

At the 5% level

0.0456 < 0.05, which means that the null hypothesis is rejected.

7 0
3 years ago
What is 1+1 plz help
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Answer:

2

Step-by-step explanation:

1+1=2

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2 years ago
WILL GIVE THE BRAINIEST, THANKS, AND A 5 STAR RATING WITH 15 POINTS HELP ME PLZZ.
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Ermm, Don't you think it's 60?

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Step-by-step

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