CPM Homework Help : PC Problem 9-39

Hint (a):

Write and expression for the area and multiply that by the cost per square foot.

Area: x²
Cost: 3x²

Hint Answer (a):

Hint (b):

Write an expression for the area of one side.
Write an expression for the area of four sides.
Write an expression for the cost of four sides.

Hint Answer (b):

Area: 4xh
Cost: (1)(4xh) = 4xh

Hint (c):

This is the sum of your expressions from parts (a) and (b).

100 = x²h

$h = \frac{100}{x^2}$

Setp 1(d):

Substitute 'h' into the equation in part (c).

Step 2(d):

Graph (e):