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3 years ago

Is (-2,-3) a solution of the graphed system of inequalities?

Mathematics

1 answer:

makkiz [27]3 years ago

4 0

No. A solution is any co ordinated that lies in the blank space on the graph. (-2,-3) is in the blue shades section so it is not a solution.

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Which explains whether or not the values in the table represent a direct variation?

Assoli18 [71]

Answer:

This function represents a direct variation because it passes through the origin and has a constant rate

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3 years ago

For every 45 vehicles up past 15 are many vans so how many minivans would pass if there were 60 vehicles

Colt1911 [192]

The case is about proportional relatioship so to slove it you have to do this.
45(V) ?
____ x ____
60(V) 15

45*15=675
60*?=60
675 DIVIDE BY 60=11.25
so the answer is 11.25
hope it help you
thank you
:)

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3 years ago

If you want to be 95% confident of estimating the population mean to within a sampling error of plus or minus3 and the standard

Aleksandr [31]

Answer:

The sample size required is at least 171

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.95}{2} = 0.025$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.025 = 0.975$ , so $z = 1.96$

Now, find the margin of error M as such

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

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

What sample size is required?

A samle size of at least n is required, in which n is found when $M = 3, \sigma = 20$

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

$3 = 1.96*\frac{20}{\sqrt{n}}$

$3\sqrt{n} = 20*1.96$

$\sqrt{n} = \frac{20*1.96}{3}$

$(\sqrt{n})^{2} = (\frac{20*1.96}{3})^{2}$

$n = 170.7$

Rouding up

The sample size required is at least 171

5 0

2 years ago

An 80 meter rope is suspended at its two ends from the tops of two 50 meter flagpoles. If the lowest point to which the midpoint

Agata [3.3K]

Answer:

qwerty

Step-by-step explanation:

7 0

2 years ago

Read 2 more answers

What’s 70.49 divided into 19

LUCKY_DIMON [66]

Answer:

3.71

Step-by-step explanation:

just divide 70.49 and 19

4 0

3 years ago

Read 2 more answers