Answer
$60$
Work Step by Step
Looking at the row corresponding to $T=90$, we see that $f(90,h)=100$ when $h=60$
Calculus 8th Edition
by Stewart, James
Published by
Cengage
ISBN 10:
1285740629
ISBN 13:
978-1-28574-062-1
Chapter 14 - Partial Derivatives - 14.1 Functions of Several Variables - 14.1 Exercises - Page 939: 7
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