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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 -

    let the missing dimension be x in
    SA = 2(10)(3) + 2(10)(x) + 2(3)(x)
    190 = .....

    solve for x

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