+0

# Jessicas question

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457
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how many square feet of cardboard does jessica have to make a rectangular prism if she has a length of 16 inches a width of 9 inches and a height of 4 inches??

Guest Mar 31, 2017
#1
+193
-1

V=l*w*h

V=16*9*4

V=576

A=l*w

A=16*9

A=144

Snappingtunic99  Mar 31, 2017
#2
+89775
+1

I assume  you have a prism with a length of 16 inches, a width of 9 inches and a height of 4 inches and you want to know the surface area

1st...convert these to feet

16 in  =  1 + 1/3 ft  = 4/3 ft

9 in  =    3/4 ft

4 in  = 1/3 ft

And the surface area  =

2 [ 4/3 * 3/4  + 4/3 * 1/3 +  3/4* 1/3 ] =

2 [ 1  + 4/9 + 1/4 ] =

2 [ ( 36 + 16 + 9 ) / 36 ] =

(1/18) ( 61) =

(61 / 18)  sq ft  ≈  3.38 sq ft.

CPhill  Mar 31, 2017

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