Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 1 - Section 1.7 - Modeling with Equations - 1.7 Exercises - Page 75: 23

Answer

x= 86

Work Step by Step

82(1/5)+75(1/5)+71(1/5)+x(2/5) 82+75+71+2x=400 2x=400-228 2x=172 x=86
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