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3 years ago

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Mathematics

1 answer:

Sedaia [141]3 years ago

6 0

Did you know the moon has moonquakes.

bruh

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Given: x + 2y = -6. Solve for y.

zavuch27 [327]

Answer:

The answer is option 3.

Step-by-step explanation:

The steps are :

$x + 2y = - 6$

$2y = -x - 6$

$y = \frac{ - x - 6}{2}$

7 0

3 years ago

Read 2 more answers

Need help with this dividing whole numbers thing

Dvinal [7]

Answer:

72 : n = 18. n x 18 = 72

n : 18 = 72. 72 x 18 = n

72 : 18 = n

Step-by-step explanation:

8 0

3 years ago

I tried 90 but it’s not right, what would it be? HELP PLEASE!!!!

dangina [55]

Answer:

m∠DBF = 92°

Step-by-step explanation:

The given statements tell you that points E and F are midpoints of their respective sides of the triangle. Hence EF is parallel to AB and ...

ΔABC ~ ΔEFC

That means ∠DBF ≅ ∠EFC and their measures are 92°.

3 0

3 years ago

The water works commission needs to know the mean household usage of water by the residents of a small town in gallons per day.

valina [46]

Answer:

A sample of 179 is needed.

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:

$\alpha = \frac{1 - 0.85}{2} = 0.075$

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 $1 - 0.075 = 0.925$ , so Z = 1.44.

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.

A previous study found that for an average family the variance is 1.69 gallon?

This means that $\sigma = \sqrt{1.69} = 1.3$

If they are using a 85% level of confidence, how large of a sample is required to estimate the mean usage of water?

A sample of n is needed, and n is found for M = 0.14. So

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

$0.14 = 1.44\frac{1.3}{\sqrt{n}}$

$0.14\sqrt{n} = 1.44*1.3$

$\sqrt{n} = \frac{1.44*1.3}{0.14}$

$(\sqrt{n})^2 = (\frac{1.44*1.3}{0.14})^2$

$n = 178.8$

Rounding up

A sample of 179 is needed.

7 0

3 years ago

algol [13]

Answer:

$\boxed{\sf{4}}}$

Step-by-step explanation:

Use a slope form.

Slope:

$\sf{\dfrac{y_2-y_1}{x_2-x_1}=\dfrac{rise}{run} }$

y₂ = (17)

y₁ = (1)

x₂ = (2)

x₁ = (-2)

Then, rewrite the problem.

Solve.

$\sf{\dfrac{17-1}{2-(-2)}=\dfrac{16}{4}=\dfrac{16\div4}{4\div4}=\dfrac{4}{1}=\boxed{\sf{4} }$

Therefore, the slope is 4, which is our answer.

I hope this helps you! Let me know if my answer is wrong or not.

5 0

2 years ago