SAT Math Practice Question #7581 - SATify | SATify

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SAT Math Practice Question #7581 - SATify | SATify

#7581

equations

algebra

functions

substitution

radicals

roots

medium

45 sec

Calculator OK

The function $f$ is defined by $f (x) = 3 x$ . For what value of $x$ does $f (x) = 15$ ?

A.

5

B.

9

C.

15

D.

25