Question

Find the 80th term of the following arithmetic sequence.
17, 26, 35, 44,

Answer 1

728

Explanation:

formula is

Tn= a+(n-1)d

where a is the first term, d is the common difference and n is the term you are looking for

T80 = 17+(80-1)*9

T80= 17+ (79)*9

T80= 17 + 711

T80= 728