Answer :
Well perimeter can be found with the equation P = 2w + 2l where p is perimeter, l is length and w is width. Substitute 18 in for l and 68 for p:
2w + 2(18) = 68
D. 2w + 36 = 68 is the equation.
2w + 2(18) = 68
D. 2w + 36 = 68 is the equation.