Answer
$y=60$
Work Step by Step
The model is given as:
$$y=k\sqrt x$$
Substitute $x=4$ and $y=12$ to find $k$:
$$12=k\sqrt 4$$
$$12=2k$$
$$k=6$$
So the model is:
$$y=6\sqrt{x}$$
Find $y$ when $x=100$:
$$y=6\sqrt{100}=6\cdot 10=60$$
College Algebra (11th Edition)
by Lial, Margaret L.; Hornsby John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671791
ISBN 13:
978-0-32167-179-0
Chapter 3 - Test - Page 382: 21
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