Question

find the 8th term of the sequence defined by the given rule:

f(1)=5

f(n)=f(n-1)+2

Answer 1

f(1) = 5
f(2) = f(1) + 2 = 7
f(3) = f(2) + 2 = 9
....
keep going

or , it looks like

f(n) = 2n + 3
f(8) = 16+3 = 19