Question 537497
P = 2L + 2W<P>
For L = 1 that is:<P>
P = 2+2W<P>
If the width increases by 3 units it becomes w+3. 
P=2(1) + 2(w+3) = 2 + 2W + 6 = 2W+8<P>
It has increased by 6<P>
2W + 8 - (2 + 2W) = 2W + 8 - 2 - 2W = 6
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