Question

Find the 20th term of the arithmetic sequence 15, 9, 3, -3, ...

Answer 1

The 20th term is -106

15,9,3,-3,-9,-15,-21,-28,-35,-41,-46 (10) -6 x 10 = -60

-60 + -46

-106

You're just subtracting by 6.

Answer 2

-99

Explanation:

you subtract by 6 every number.....

-3-6=-9

-9-6=-15

so on and so on until you get to the 20th term.....