Question

What is the common difference of a 57-term arithmetic sequence where the first term is -25 and the sum is 17,727?


answers:
11
11.5
12
12.5

Answer 1

do you know the formula for sum of arithmetic series?

Answer 2

i know very little sorry

Answer 3

okay.. \[\large S_n = \frac{n(A_1 + A_n)}{2}\] where Sn = sum of arithmetic series
n= number o terms
A1 = first term
An = last term/nth term

now can you identify which are given to you

Answer 4

ok i will give it a shot

Answer 5

great :D