Answer
$h=\frac{A-2lw}{2l+2w}$
Formula gives surface area (A) of a rectangular prism
Work Step by Step
$A = 2lw + 2lh + 2wh $
$A-2lw=2lh + 2wh $
$A-2lw=h(2l+2w)$
$h=\frac{A-2lw}{2l+2w}$
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