Answer
$D$.
Work Step by Step
If the exponent of the variable of a function is not $1$, then it is not a linear function.
Thus, the function $f(x)=x^2$ is not linear.
Therefore, the answer is Option $D$.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 2 - Graphs and Functions - 2.4 Linear Functions - 2.4 Exercises - Page 227: 6
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