The formula p = 2l + 2w means that the perimeter of a rectangle is equal to twice the sum of its length and its width. solve p = 2l + 2w for l.

Solving for l in the formula p = 2l + 2w gives option B as the correct option
Given data
The formula p = 2l + 2w
make l the subject of formula.
this is achieved by the steps below
p = 2l + 2w
p - 2w = 2l
l = ( p - 2w ) / 2
option B match the solution hence the answer
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