SAT Math Practice Question #17189 - SATify | SATify

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SAT Math Practice Question #17189 - SATify | SATify

#17189

absolute value

functions

medium

120 sec

The function $f$ is defined by $f (x) = ∣ x - 4 x ∣$ . What value of $a$ satisfies $f (5) - f (a) = - 15$ ?

A.

$- 20$

B.

$5$

C.

$10$

D.

$45$