Precalculus (10th Edition)

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


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.
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