College Algebra (6th Edition)

Published by Pearson
ISBN 10: 0-32178-228-3
ISBN 13: 978-0-32178-228-1

Chapter 1 - Equations and Inequalities - Exercise Set 1.7 - Page 198: 119


from $80$ to $110$ minutes

Work Step by Step

Use the given information in the problem to create an inequality based on the original equation. Then subtract $20$, divide by $0.40$, and add $60$ on all three sides to solve for $x$. $C=20+0.40(x-60)$ $28\leq C\leq40$ $28\leq20+0.40(x-60)\leq40$ $8\leq0.40(x-60)\leq20$ $20\leq(x-60)\leq50$ $80\leq x\leq110$
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