The 8th term of an AP is 38 and the 12rh term is 58.find the 30th term

Answer 1

a+7d=38
a+11d=58
subtract
4d = 20
d=5
backsub
a+35=38
a = 3

now use your formulas I use to find term30

Answer 2

Tn=a+(n-1)d,3+(30-1)*5=148