Answer :
L = 5W
A = LW = 405
plug in 5W FOR L
A = LW
A = (5W)W = 405
5W^2 = 405
W^2 = 405/5
W^2 = 81
Take the squareroot
w = 9
L = 5W
We now know W = 9
L=5(9)
L =45
P=2(L+W)
P =2(45 + 9)
P =108
A = LW = 405
plug in 5W FOR L
A = LW
A = (5W)W = 405
5W^2 = 405
W^2 = 405/5
W^2 = 81
Take the squareroot
w = 9
L = 5W
We now know W = 9
L=5(9)
L =45
P=2(L+W)
P =2(45 + 9)
P =108