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) =

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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