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25 October, 22:36

A function is defined by f (x) = 5 (2-x). What is f (-1) ?

-5

5

15

53

+3
Answers (2)
  1. 25 October, 22:37
    0
    15 because if you substitute - 1 in for x then you have a double negative, that becomes positive and 2+1=3 and 3•5=15
  2. 25 October, 22:40
    0
    Answer:e

    Step-by-step explanation:

    f (x) = 5 (2-x)

    = 10 - 5x

    For f (-1) = 10 - 5 (-1)

    = 10 + 5

    = 15
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