Question 93443
Width(W) of rectangle=2x-5 ft
Length(L) of rectangle=3x+9 ft

And we know that the Perimeter (P(x)) of rectangle=2W+2L

So our equation is:

2(2x-5)+2(3x+9)=P(x)  get rid of parens

4x-10+6x+18=P(x)  collect like terms

10x+8=P(x)  if x=4, then:

P(4)=10*4+8=48 ft


CK
If x=4, then:
Width(W)=2x-5=2*4-5=3 ft
and Length(L)=3x+9=3*4+9=21

Perimeter (P)=2W+2L=2*3+2*21=6+42=48
48=48


Hope this helps----ptaylor