Question

The 15 th term Of an arithmetic sequence Is -9 And comman diffrence is -2/3

Answer 1

Step-by-step explanation:

Given:

1. a15=> a+14d=-9.
2. c.d=-2/3.

Substituting d in a15 we get:

=> a+14(-2/3)=-9

=> a-28/3=-9

=> 3a-28=-9×3

=> 3a-28=-27

=> 3a=-27+28=1

a=1/3.