Answer:
21
Step-by-step explanation:
f(x) =x^2 - 6x + 21
f(xl =0
substitute 0 for x
f(0) = 0^2 - 6(0) + 21
0. = 0 - 0 + 21
0. = 21
2.b
3.a
4.c
hope it helps you
I think it's A
I hope this helps
a...