Linear Functions

SAT Math· difficulty 4/5

If f(x)=2x+3f(x) = 2x + 3, what is (f1f1)(13)(f^{-1} \circ f^{-1})(13)?

  • A

    1-1

  • B

    22

  • C

    11

    check_circle
  • D

    00

Explanation

f1(x)=(x3)/2f^{-1}(x) = (x - 3)/2. f1(13)=5f^{-1}(13) = 5. f1(5)=1f^{-1}(5) = 1.

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