13.5/3 = 4.5
He hiked for 4.5 hours.
Find the sum of the first 4 terms
2, -8, 32, -128 are the first 4 terms
<em>2 + (-8) + 32 + ( - 128)</em>
2 + ( - 8) = -6
-6 + 32 = 26
-128 + 26 = -102
-102 is the sum of the first four terms
hope this helps
Answer:
I'm not smart but I think there's no solution
The mean will be 17.9
all you have to do is add all of the numbers then divide them by the total amount of numbers
hope this helps