Question 323889
Length = 4x

Width = x

Area = 324

324 = (4x)(x)

324 = 4x^2

324/4 = x^2

81 = x^2

sqrt[81] = sqrt[x^2]

9 = x

We find the perimter using P = 2L + 2W.

P = 2(4x) + 2(x)

P = 2(4*9) + 2(9)

P = 2(36) + 18

P = 72 + 18

P = 90 yards