Answer
a) 9cm
b) 5in
Work Step by Step
a)
10x+6x=144
16x=144
x=9
b)
14x + x(x+13) = 160
14x + $x^{2}$ + 13x = 160
$x^{2}$ + 27x-160=0
(x+32)(x-5)=0
x=-32 or x=5
Dimensions can't be negative so the only answer is 5
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 76: 47
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