Homework Help: geometry

Posted by Mary on Monday, May 23, 2011 at 8:11pm.

The surface area of a rectangular prism is 190 square inches, the length is 10 inches, and the width 3 inches. Find the height.

I know how to do SA but I don't understand how to find height if you have SA given. The answer is 5 in but I am not able to come up with the right answer.

geometry - PsyDAG, Tuesday, May 24, 2011 at 11:01am
Let x = height.

2(10*3) + 2(3x) + 2(10x) = 190

Solve for x.

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