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| PAGE: 159 | SET: Exercises | PROBLEM: 36 |
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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