Question

A=-10 d=? N=15 an=18

Answer 1

an=a+(n-1)d
18=-10+(15-1)d
18=-10+14d
18+10=14d
28=14d
d=28/14
d=2


hope it helps you

Answer 2

Heya!
Here given A=-10 ,N=15 and an =18.
To find d=?
⇒an=a+(n-1)d
⇒18=-10+(15-1)d
⇒18=-10+14d
⇒18+10=14d
⇒d=28/14
⇒d=2.


Hope this helps you ☺