college algebra
posted by Ash .
find a general term for the sequence
a1,a2,a3,a4.....
15,23,31,39

notice that they increase by 8
so
t(n) = 8n + b
when n=1 we want that to be 15
15 = 8+b
b = 7
term(n) = 8n + 7
check :
t(4) = 8(4) + 7 = 39 , looks good!