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3 years ago

Can someone help me with number one and 2

Mathematics

1 answer:

Elena L [17]3 years ago

5 0

Answer:

Subtract

Add

Step-by-step explanation:

When you add together the two equations, you get:

6x = 18, which is missing the Y

I hope this helped!

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Which choice is equivalent to the fraction below? Hint: Rationalize the denominator and simplify.

inna [77]

Answer:

$\boxed{\text{D. }3\sqrt{2}}$

Step-by-step explanation:

Multiply numerator and denominator by √2

$\dfrac{6}{\sqrt{2}} = \dfrac{6}{\sqrt{2}} \times \dfrac{\sqrt{2}}{\sqrt{2}}\\\\= \dfrac{6\sqrt{2}}{2}\\\\= \boxed{3\sqrt{2}}$

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4 years ago

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aalyn [17]

Answer:

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3 years ago

PLEASE HELP NEED ASAP!

Scrat [10]

Answer:

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Step-by-step explanation:

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3 years ago

Help!! <br>2x+3 (x-4)=x-20

prohojiy [21]

Remember you can do anything to an equation as long as you do it to both sides

2x+3(x-4)=x-20
first distribute
2x+3(x)+3(-4)=x-20
2x+3x-12=x-20
5x-12=x-20
minus x both sides
4x-12=-20
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8 0

4 years ago

A researcher surveyed 220 residents of a city about the number of hours they

olga55 [171]

Answer:

Margin of error of 0.0485 hours.

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 $1 - \alpha$ .

That 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.

In this question:

$\sigma = 0.35, n = 220$

The margin of error is of:

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

$M = 1.96\frac{0.35}{\sqrt{200}}$

$M = 0.0485$

Margin of error of 0.0485 hours.

5 0

3 years ago