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3 years ago

What is the surface area of a right rectangular prism with a width of 12 inches, a length of 6 inches, and a height of 8 inches?

Mathematics

1 answer:

dalvyx [7]3 years ago

7 0

The answer would be d) 576

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Please help me with this i need a real answer not tjose file things

anyanavicka [17]

Answer:

Step-by-step explanation:

3 0

2 years ago

A simple random sample of electronic components wil be selected to test for the mean lifetime in hours. Assume that component li

Serjik [45]

Answer:

189 components must be sampled.

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:

$\alpha = \frac{1 - 0.99}{2} = 0.005$

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 $1 - 0.005 = 0.995$ , so Z = 2.575.

Now, find the margin of error M as such

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

Assume that component lifetimes are normally distributed with population standard deviation of 16 hours.

This means that $\sigma = 16$

How many components must be sampled so that a 99% confidence interval will have margin of error of 3 hours?

n components must be sampled.

n is found when M = 3. So

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

$3 = 2.575\frac{16}{\sqrt{n}}$

$3\sqrt{n} = 2.575*16$

$\sqrt{n} = \frac{2.575*16}{3}$

$(\sqrt{n})^2 = (\frac{2.575*16}{3})^2$

$n = 188.6$

Rounding up:

189 components must be sampled.

4 0

3 years ago

What is the measure of angle c?

svlad2 [7]

Answer:

c=29°

Step-by-step explanation:

angle b=97°{ vertically opposite angle}

now,

97°+54°+c=180°{ sum of angle of triangle}

x=180-151
x=29°

<h2>stay safe healthy and happy.</h2>

4 0

3 years ago

Read 2 more answers

Is the statement 2(3+5x)=6+5x always true?

mihalych1998 [28]

No that statement is not always true. There is only one solution to this equation.

5 0

3 years ago

Read 2 more answers

Maria deposits $1,950 into a savings account that earns simple interest at a rate of 3%. She makes no withdrawals. How much inte

Elenna [48]

Answer:

x = .06418

Step-by-step explanation:

2 + (9.2)−8x = 2.32

(9.2)−8x = 2.32 − 2

log (9.2)−8x = log .32

−8x log 9.2 = log .32

−8x log 9.2

−8 log 9.2

log .32

−8 log 9.2

x = .06418

6 0

3 years ago