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5 May, 16:00

Use only the digits 0 - 9 and the decimal and the negative sign, if needed, to fill in the blank. If f (x) = 2x + 9, then f (-1) =

+2
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  1. 5 May, 19:13
    0
    7

    Step-by-step explanation:

    Replace both instances of x in f (x) = 2x + 9 with - 1:

    f (-1) = 2 (-1) + 9 = 7

    Thus, f (-1) = 7
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