You know if something is a function or not because the X will never be used twice in a set. If it is, then it's not a function.
A. Uses -1 twice
B. Uses Nothing twice (good)
C. Uses 0 twice
D. Uses 0 twice
B is your answer
8: 20
9: 90
I am so sorry if this is wrong. I am not good at this type of things
Answer:
726
Step-by-step explanation:
If you take the number 200 and add 526 to it, it equals 726.