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2 years ago

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If (-2, y) lies on the graph of y = 4x, then y = -16 1/16 16

2 answers:

emmasim [6.3K]2 years ago

7 0

Y = 4x
(-2,y).....x = -2

y = 4(-2)
y = -8

Korolek [52]2 years ago

6 0

Answer:

Step-by-step explanation:

(-2, y) lies on the graph of $y = 4^x$

It means for x=-2 we need to find the y =?

means we plug x=-2 in the given equation $y = 4 ^x$

so we get

$y = 4^ (-2)$

$y = \frac{1}{4^2}$

$y = \frac{1}{16}$

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2 years ago

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3 years ago

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2 years ago

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

andreyandreev [35.5K]

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 $X = 3.1$

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This means that $\sigma = 0.5$

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

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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.

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7 0

3 years ago

Mikel is trying to save for college expenses. He has a job, but can only afford to put $20 per month aside. He has 4 years until

nadezda [96]

Answer:

960

20 times 12 moths to get 240 then multiply that by 4 years and get 960 .

Step-by-step explanation:

sorry if wrong ]

have a good day /night

may i pleae have a branlliest .

20 x 12=240 x 4 =960

4 0

2 years ago

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