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3 years ago

Please help, If you can't help that is fine but if you can it would be appreciated :)

Mathematics

1 answer:

Dovator [93]3 years ago

4 0

Answer:

the answer is B

Step-by-step explanation:

-4 * box

and you know that is meant to be 8 so you have to ask what would x 4 and give you -8 so you do -8/-4 to give you 2 so that means you know that that is -4 * 2 which would give you - 8 then that will replace all the other missing box.

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Pls show working 3 friends shared the driving on a long trip. Marla drove 7 miles more than Guido. Guido drove five times as far

olga2289 [7]

Step-by-step explanation:

Marla drove 567

Gudio drove 560

The trip was 679

5 0

2 years ago

Read 2 more answers

A company claims that less than 10% of adults own a smart watch. You want to test this claim, and you find that in a random samp

Nezavi [6.7K]

Answer:

Test statistic is 0.67

Critical value is -2.33

Step-by-step explanation:

Consider the provided information.

The formula for testing a proportion is based on the z statistic.

$z=\frac{\hat p-p_0}{\sqrt{p_0\frac{1-p_0}{n}}}$

Were $\hat p$ is sample proportion.

$p_0$ hypothesized proportion and n is the smaple space,

Random sample of 100 adults, 12% say that they own a smart watch.

A company claims that less than 10% of adults own a smart watch.

Therefore, n = 100 $\hat p$ = 0.12 , $P_0$ = 0.10

$1 - P_0 = 1 - 0.10 = 0.90$

Substitute the respective values in the above formula.

$z=\frac{0.12-0.10}{\sqrt{0.10\frac{0.90}{100}}}$

$z\approx 0.67$

Hence, test statistic = 0.67

This is the left tailed test.

Now using the table the P value is:

P(z < 0.667) = 0.7476

P-value = 0.7476

$\alpha = 0.01$

Here, P-value > α therefore, we are fail to reject the null hypothesis.

$Z_{\alpha}= Z_{0.01} = -2.33$

Hence, Critical value is -2.33

7 0

3 years ago

/sqrt{4x+15=3/sqrt{x}<br><br>what does x equal?

irga5000 [103]

$\frac{\sqrt{4x+15} }{\sqrt{x} } =3$

Answer:

Step-by-step explanation:

Multiply both sides by x to get rid or the denominator: $\sqrt{4x+15}=3\sqrt{x}$

Get rid of the square root by squaring both sides: $\left(\sqrt{4x+15}\right)^2=\left(3\sqrt{x}\right)^2$ = 4x + 15 = 9x

Just solve for x.

<em>Hope this helps!!</em>

3 0

3 years ago

Solve for x: 1/2 (10x+6)=-2x+10

pickupchik [31]

Answer: x = 1

Step-by-step explanation:

substitute 1 for x

1/2(10(1)+6) = -2(1)+10

1/2(10+6) = -2+10

5+3 = -2+10

8=8

8 0

2 years ago

Successive weekly sales, in units of one thousand dollars, have a bivariate normal distribution with common mean 40, common stan

ruslelena [56]

Answer:

the solution has been given in the attachments

Step-by-step explanation:

6 0

4 years ago