Answer
See below.
Work Step by Step
He mixed up where to place joint and inverse variation in the fraction. The correct answer is: $z=\frac{axy^3}{\sqrt w}$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 8 Rational Functions - 8.1 Model Inverse and Joint Variation - 8.1 Exercises - Skill Practice - Page 556: 34
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