Question

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

Answer 1

17727/57=311
-25+28n=311
28n=336
n=12

Answer 2

THank you, can you help me wiht one more?

Answer 3

ok. sure

Answer 4

What is the sum of a 12-term arithmetic sequence where the last term is 13 and the common difference is -10?

Answer 5

a1=123 a2=113 a3=103 ...
(123+13)(123-13+10)/20=816

Answer 6

Thank you so much!

Answer 7

welcome :)