What is f(–5)? A. 15 B. 5 C. –5 D. 0

no idea. what is f(x) ?

You need to substitute (-5) into your function everywhere the x appears, sub it in, and solve for y. Or if you have a graph you need to look at the x-axis at 5, and look up and down to see where the graphed function is at that point.

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