an=a1+d(n-1)
an=nth term
a1=first term
d=common difference
n=which term or the term number
so first term is 5
common difference is 3 because each term is 3 apart
so
an=5+3(n-1)
8. 5 and 8
9. 8-5=3 so the common difference is 3
10. can't see but an=5+3(n-1) or an=2+3n is the equation for the sequence