Answers

2016-06-26T10:13:52+08:00
A1=3(1)+5;a1=3+5;a1=8
a2=3(2)+5;a2=6+5;a2=11
a3=3(3)+5;a3=9+5;a3=14
8,11,14,17,20,23,26,...
their common difference or called arithmetic is 3;8+3=11+3=14
to find the 12 term you just follow this formula only if arithmetic an=a1+(n-1)d
a12=8+(12-1)3 
a12=8+(11)3
a12=8+33
a12=41

3 4 3