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3 years ago

Finding surface area (picture provided)

Mathematics

2 answers:

777dan777 [17]3 years ago

8 0

Yes the answer should be 240^^

katrin2010 [14]3 years ago

5 0

Answer:

Step-by-step explanation:

Remember that triangle's area is 1/2 x b x h. But we have 2 congruent triangles so we have 2 x 1/2 x b x h. so the area of 2 triangles is b x h.

You should know the areas of other sides.

5 x 6 + 6 x 12 + 6 x 13 + 5 x 12

Simplify!

30+72+78+60

90+150

240

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A machine that produces a major part for an airplane engine is monitored closely. In the past, 10% of the parts produced would b

nata0808 [166]

Answer:

With a .95 probability, the sample size that needs to be taken if the desired margin of error is .04 or less is of at least 216.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

For this problem, we have that:

$p = 0.1$

95% confidence level

So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - \frac{0.05}{2} = 0.975$ , so $Z = 1.96$ .

With a .95 probability, the sample size that needs to be taken if the desired margin of error is .04 or less is

We need a sample size of at least n, in which n is found M = 0.04.

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.04 = 1.96\sqrt{\frac{0.1*0.9}{n}}$

$0.04\sqrt{n} = 0.588$

$\sqrt{n} = \frac{0.588}{0.04}$

$\sqrt{n} = 14.7$

$(\sqrt{n})^{2} = (14.7)^{2}$

$n = 216$

With a .95 probability, the sample size that needs to be taken if the desired margin of error is .04 or less is of at least 216.

7 0

4 years ago

Select all the values of x from this list that make the inequality FOR POINTS!

denis23 [38]

The answer would be A D E

8 0

3 years ago

How do u estimate 92×68? Add the finished product Too.

disa [49]

You round 92 to 90. Then you round 68 to 70. Now you know that 9x7 = 63. You add to zeros to that answer and get 6300. So 92x68 is about 6300. The actual answer of the problem 6256 that will round up to 6300

6 0

4 years ago

Graph the linear equation. 3x−4y=12 Please show it on a graph

baherus [9]

Answer: The graph is attached.

Step-by-step explanation:

By definition, the line intersects the y-axis when $x=0$ .