Pre-Calculus, 9th edition
36

 PAGE: 159 SET: Exercises PROBLEM: 36
Please look in your text book for this problem Statement

The revenue function is .

(a).

At what price ,the revenue is zero.

Therefore  ball will strike the ground at distance

Substitute in .

or .

The revenue is zero where price is \$ and \$.

(b).

The revenue  is\$ .

Therefore substitute in .

Find the vertex of above quadratic function .

Compare it to .

, and .

Since , then the parabola open upward.

coordinate of vertex is

Vertex

Graph:

Graph the quadratic equation

Draw the coordinate plane.

Plot the intercepts and vertex.

Connect the plotted points.

observe the graph:

The price is in between \$ and \$.

Hence .

(a).The price is \$ and \$.

(b)..

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