Question

The function f(x)=2.5(2x2-4x-6) models the cost, in dollars, of a rug with the width x feet. What is the cost of a rug that is 9 feet wide?

Answer 1

300 dollars

Explanation:

`f(x)=2.5(2x^2-4x-6)\\x = 9\\f(9)=2.5(2(9)^2-4(9)-6)\\f(9) = 300`