Answer
No calculators were sold, hence the revenue is 0.
Work Step by Step
If the price is 140 dollars, then the number of calculators sold is:
$x=21000-150(140)=21000-210000=0$.
Hence no calculators were sold resulting tp zero revenue.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 3 - Linear and Quadratic Functions - 3.4 Build Quadratic Models from Verbal Descriptions and from Data - 3.4 Assess Your Understanding - Page 157: 31
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