Posted by Mary on Monday, May 23, 2011 at 6:45pm.
The surface area of a rectangular prism is 190 square inches, the length is 10 inches, and the width 3 inches. Find the height.

Geomertry  PsyDAG, Tuesday, May 24, 2011 at 11:08am
Substitute 4d for e in second equation and solve for d. Insert that value into the first equation and solve for e. Check by inserting both values into the second equation.
See your later post.

Geomertry  Henry, Tuesday, May 24, 2011 at 11:27am
The following areas are equal:
1. Front and Back.
2. Left and right.
3. Top and Bottom.
Therefore, we calculate 3 areas and
multiply each by 2 to get the 6 areas:
As=2(3*h) + 2(10*h) + 2(10*3)=1901n^2.
6h + 20h + 60 = 190,
26h = 190  60 = 130,
h = 5in.
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