Question

What’s the 69th term of the arithmetic sequence -13, -33, -53

Answer 1

(-1373)

Explanation:

a = 1st term = -13

Common difference = d = 2nd term - 1st term

d = -33 - (-13) = -33 + 13

d = -20

n = 69

nth term = a + (n-1)d

69th term = (-13) + 68 * (-20)

= -13 - 1360

= - 1373