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The simplified expression is 40 - 12s
You can achieve 39 using four 4s with the following expression: ( (4 \times 4 \times 4) - 4/4 ). This simplifies to ( 64 - 1 ), which equals 39.
16s + 4s = 20s
(4s + 1)(4s + 1) or (4s + 1)2
since A=4S then S=A/4 A is not 4S. The perimeter P is 4S. The area is S multiplied by S or S squared. therefore the side of a square is the square root of the area.