Question

Find the 81st term of the arithmetic sequence -10, -25, -40

Answer 1

-1210

Explanation:

The nth term is -10-(15(n-1)) so

-10-(15(80)=

-10-1200=

-1210

Answer 2

5 - (N x 15)

81 x 15 = 1215

5-1215=-1210

-1210 should be the 81st term

Explanation: