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
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
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
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