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Yuri [45]
3 years ago
7

What is the surface area, in square inches, of a 8-inch cube?

Mathematics
2 answers:
Genrish500 [490]3 years ago
7 0

Answer: 384 in²

Step-by-step explanation: Surface area is the sum of the areas of all of the faces of a three-dimensional figure.

So to find the surface area of a cube, it's important to understand that each face of a cube has the same area. So we can simply find the area of one face of a cube and multiply it by the number of faces which is 6.

To find the area of one face of a cube, we can use the formula for the area of a square.

Area = S²

Since the length of a side is 8 inches, we have (8 in.)² or 8 inches x 8 inches which gives us 64 in.².

Now, since there are 6 sides to a cube, we have (64 in.)² (6) which is equal to 384 inches².

Therefore, the surface area of the cube is 384 in².

Nimfa-mama [501]3 years ago
6 0
Surface area of a cube=6*s^2=6*8^2=384
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The 98% confidence interval for the proportion of applicants that fail the test is (0.025, 0.067).

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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

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For this problem, we have that:

560 random tests conducted, 26 employees failed the test. This means that n = 560, \pi = \frac{26}{560} = 0.046

98% confidence level

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The lower limit of this interval is:

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The upper limit of this interval is:

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The 98% confidence interval for the proportion of applicants that fail the test is (0.025, 0.067).

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