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Mathematics

2 answers:

jeka943 years ago

6 0

Hello!

1.
To find the area of a rectangular prism you use the equation

2(wl + wh + lh)

w is width
l is length
h is height

Put in the values

2(5 * 12 + 5 * 9 + 12 * 9)

Combine like terms

2(60 + 45 + 108)

Add

2(213)

Multiply

The area is 426
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2.

The area of a cylinder uses the equation

$2 \pi rh+2 \pi r^{2}$

Put in the values you know and 3.14 for pi

$2*3.14*4*12.4+2*3.14* 4^{2}$

Solve this and you get 411.968

Round

The answer is 412 cm squared
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3.

A cereal box is a rectangular prism

You use the equation from 1 and it does not matter what values you use for what side

2(wl + wh + lh)

2(11 * 8 + 11 * 6 + 8 * 6)

2(202)

multiply

The answer is 404in squared
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4.

The equation for the volume is whl

w is width
h is height
l is length

Put in the values

4 * 2 * 1

The answer is 8
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5.

The equation for volume is V = whl

Put in the values you know

120 = 8 * 5 * h

Divide both sides by 8

15 = 5 * h

Divide both sides by 5

3 = h

The answer is 3cm
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Hope this helps!