Final answer:
To find f(9) for the function f(x) = -4x + 19, substitute 9 for x to get -36 + 19, which simplifies to -17. The correct answer is not among the provided options.
Step-by-step explanation:
To find the value of f(9) for the function f(x) = -4x + 19, we need to substitute x with 9 and simplify:
f(9) = -4(9) + 19
f(9) = -36 + 19
f(9) = -17
Therefore, the value of f(9) is -17, which means the correct answer is not listed among the provided options A) 23, B) 7, C) 55, or D) -13.