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S_A_V [24]
2 years ago
12

A stack of boards is 21 inches high. The boards are 1 3/4 inches thick.

Mathematics
1 answer:
poizon [28]2 years ago
8 0
That would be a lot of boards not sure
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Find the surface area of the composite solid.
Westkost [7]

We have:

4 triangles with the base b = 5ft and the height h = 6ft

4 rectangles with the lenght l = 5ft and the width w = 4ft

1 square with side a = 5ft.

The formula of an area of a riangle:

A_T=\dfrac{1}{2}bh

Substitute:

A_T=\dfrac{1}{2}(5)(6)=\dfrac{1}{2}(30)=15\ ft^2

The formula of an area of a rectangle:

A_R=lw

Substitute:

A_R=(5)(4)=20\ ft^2

The formula of an area of a square:

A_S=a^2

Substitute:

A_S=5^2=25\ ft^2

The Surface Area of composite solid:

SA=4A_T+4A_R+A_S

Substitute:

SA=4(15)+4(20)+25=60+80+25=165\ ft^2

<h3>Answer: The Surface Area of the composite solid is 165 ft².</h3>
3 0
3 years ago
What is (-10/-25)5+24x85=
Marina86 [1]

Answer:

2042

Step-by-step explanation:

Do you need a step by step?

4 0
2 years ago
Read 2 more answers
How many inches are in 8.5 feet (show work please thank you you)
GalinKa [24]
8.5 feet(12 inches per foot)= 102 inches total
There are 102 inches in 8.5 feet
7 0
3 years ago
What’s the correct answer <br> I need a correct answer ASAP!!!!!
Illusion [34]

Answer:

the first answer

3 1/3 that's the correct answer

5 0
2 years ago
Consider the given right triangle. If and a = 25 m,<br> then b =<br> m.
Elza [17]

Answer:

Assuming that a and b are not the hypotenuse then B would be equal to A, so B would equal 25m

Step-by-step explanation:

I hope this is right, you didn't put a picture.

8 0
3 years ago
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