#### 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 $D$.

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$D$.

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