100, 110, 120, 130, (Use the equation an= a1 + (n - 1)d
step 1
Find the common difference d
we have
a1=100
a2=110
a3=120
a4=130
so
a2-a1=110-100=10
a3-a2=120-110=10
a4-a3=130-120=10
the common difference d is equal to 10
d=10
step 2
substitute in teh formua

If you want to calculate the a7 term
then
For n=7
substitute in the formula
