Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 3 - Solving Inequalities - 3-6 Compound Inequalities - Practice and Problem-Solving Exercises: 52

Answer

a) $ 102.5 \leq R \leq 184.5$ b) 22 years old

Work Step by Step

a) $0.5*(220-a) \leq R \leq 0.9*(220-a)$ $0.5*(220-15) \leq R \leq 0.9*(220-15)$ $0.5 * 205 \leq R \leq 0.9 * 205 $ $ 102.5 \leq R \leq 184.5$ b) $99 = 0.5 * (220-a)$ $99 * 2 = 2 * 0.5 * (220-a)$ $198 = 220 - a $ $198 - 198 + a = 220 - 198 - a + a$ $a = 22 $ $x = 0.9 * (220 - 22)$ $x = 0.9 * 198 $ $x = 178.2$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.