Answer:
C(w) = w + 1520
Step-by-step explanation:
The perimeter of a rectangle is when you add all the sides together.
Let's say w=width and l=length.
Perimeter = 2w + 2l --> Perimeter = 380
380= 2w + 2l
Now create the cost equation.
C(w) = 9*2w + 8*2l.
We want the equation in terms of l so modify the first equation so we can plug it into the second.
380-2w=2l ---> Divide both sides by two.
190-w = l ---> Now plug into cost equation.
C(w) = 18w + 16(190-w)
C(w) = 18w + 3040 - 16w
C(w) = 2w + 3040
