Question 319323
The perimeter of a rectangle is found using P = 2L + 2W.

Width = 2x - 5

Length = 3x + 9

P(x) = perimeter or P

P(x) = 2(3x + 9) + 2(2x - 5)

P(x) = 6x + 18 + 4x - 10

P(x) = 10x + 8

We now replace x with 4 and simplify.

P(4) = 10(4) + 8

P(4) = 40 + 8

P(4) = 48

Done!