Question

find 20th term of of progression -12,-5,2,9,16,22,30

Answer 1

a20=a1+19d
here a1= -2
&d=+7
-2+133
a20=131...
Hope you understand

Answer 2

Given a=-12.

d=-5-(-12)

=-5+12

=7

20 term =a+(20-1)d

=a+9d

=-12+9*7

=63-12

=51

Thats the answer.