Answer:
2
Step-by-step explanation:
Add up the numbers you are given. (-10) + (-5) + 2 + 6 + 17 = 10. Now divide by the number of values. There are 5 values. 10/5 = 2
the answer is A
I can't help u with this but I can give the formula tn=t1+(n-1)+d
12345678912334567890123546789