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9-39.
Write and expression for the area and multiply that by the cost per square foot.
Area: x2
Cost: 3x2
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.
Area: 4xh
Cost: (1)(4xh) = 4xh
This is the sum of your expressions from parts (a) and (b).
100 = x2h
Substitute 'h' into the equation in part (c).