Answer:
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Step-by-step explanation:
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So the height is 12
Let W be the width
Let W- 4 be the height
W2 +(W-4)2 = 400
So: W2 -4W-192 =0
One uses the quadratic solution:
W = (4 + (16 + 4*192).5)/2 = 16
-24
-7 - 17 = -24.