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3 years ago

What’s the surface area of this shape?

Mathematics

1 answer:

AlexFokin [52]3 years ago

5 0

Do 13 times 14 times 13 times 5 and then divide by however many sides there are on the shape . I think

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67.52 = 21.60 + 2x what is the correct answer

Rom4ik [11]

Answer:

The answer is x=22.96

Step-by-step explanation:

hope that helps

67.52=21.6+2x

67.52=2x+21.6

2x+21.6=67.52

2x+21.6−21.6=67.52−21.6

2x=45.92

2x/2=45.92/2

x=22.96

6 0

3 years ago

Please help! Find the x-intercepts of the parabola with vertex (-4, 2) and y-intercept (0, -30). Write your answer in this form:

ch4aika [34]

X1-y1
x2-y2

-4-3
0+30

-6
30

the answer would be -0.2

6 0

3 years ago

Find the ratio of the following geometric sequences

shepuryov [24]

Answer:

A: 2

B: -1/3

Step-by-step explanation:

A: We are looking for the common ratio between the terms of the sequence, which is essentially what you are multiplying by to get from one term to the next. To find this, we just have to divide the second term by the first term.

-4 / -2 = 2, therefore our common ratio is 2.

We can check this by continuing to multiply the next terms by 2 - -4 x 2 = -8, -8 x 2 = -16, so the pattern works.

B: For B, we will do exactly the same method as before: 3/-9 = -1/3, so our multiplier is -1/3.

To check: 3 x -1/3 = -1, and -1 x -1/3 = 1/3, which both follow our rule.

Hope this helps! Let me know if you have any questions.

4 0

3 years ago

An automobile manufacturer claims that its car has a 33.7 miles/gallon (MPG) rating. An independent testing firm has been contra

Gnoma [55]

Answer:

$z=\frac{34-33.7}{\frac{1.6}{\sqrt{120}}}=2.05$

And the p value would be given by:

$p_v= 2*P(z>2.05) = 0.0404$

And since the p value is higher than the significance level we have enough evidence to fail to reject the null hypothesis.

Step-by-step explanation:

Data given and notation

$\bar X=34$ represent the sample mean

$\sigma=\sqrt{2.56}= 1.6$ represent the population standard deviation

$n=120$ sample size

$\mu_o =33.7$ represent the value that we want to test

$\alpha=0.02$ represent the significance level for the hypothesis test.

z would represent the statistic (variable of interest)

$p_v$ represent the p value for the test (variable of interest)

System of hypotheses.

We need to conduct a hypothesis in order to check if the true mean is 33.7 mpg or no, the system of hypothesis would be:

Null hypothesis: $\mu =33.7$

Alternative hypothesis: $\mu \neq 33.7$

Since we know the population deviation, is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:

$z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}}$ (1)

Calculate the statistic

We can replace in formula (1) the info given like this:

$z=\frac{34-33.7}{\frac{1.6}{\sqrt{120}}}=2.05$

And the p value would be given by:

$p_v= 2*P(z>2.05) = 0.0404$

And since the p value is higher than the significance level we have enough evidence to fail to reject the null hypothesis.

6 0

3 years ago

An automobile insurance company is in the process of reviewing its policies. The company is considering increasing the premium c

tekilochka [14]

Answer:

do that work boy, stop using the internet and use your brain

5 0

3 years ago