Example 1

A local store’s monthly revenue from T-shirt sales, f(x), as a function of price, x, is modeled by the function f(x) = −5x2 + 150x − 7. Use the equation and graph to answer the following questions: At what prices is the revenue increasing? Decreasing? What is the maximum revenue? What prices yield no revenue? Is the function even, odd, or neither?
This applet is provided by Walch Education as supplemental material for their mathematics programs. Visit www.walch.com for more information.