Question

PLEASE HELP! MEDAL WILL BE REWARDED!
Write the sum using summation notation, assuming the suggested pattern continues.

-4 + 5 + 14 + 23 + ... + 131

I just need to make sure i have the correct answer!!

Answer 1

an = a1 +(n-1)d
first find n from here

Answer 2

@CarlyLiberty: Can you tell us what your answer is?

Answer 3

yes it s \[\sum_{n=0}^{n}(-4+9n)\]

Answer 4

this is the answer