The mean will be 5 points higher...so...c would be the answer!
So you just subsitute -3 for x
f(-3)=-(-3)+15
f(-3)=3+15
f(-3)=18
answer is C
18
Answer:
1 i koow
Step-by-step explanation:
This is a simple consequence of the Zero-sum problem: https://en.wikipedia.org/wiki/Zero-sum_problem