Find the 84th term of the arithmetic sequence - 27,-12,3

The answer will be 1218.

Aritmetic has a common difference

-27 to - 12 is a difference of 15

-12 to 3 is a difference of 15

an=a1+d (n-1)

a1=first term

d=common difference

fist term is - 27

common difference is 15

an=-27+15 (n-1)

84th term is n=84

a84=-27+15 (84-1)

a84=-27+15 (83)

a84=-27+1245

a84=1218

the 84th term is 1218