given f(n+1)=3f(n) and F(0)=4, what is f(3)
f(n + 1) = 3f(n)
Means that every successive term is just 3 times the previous one....so....
f(0) = 4
f(1) = 3 *4 = 12
f(2) = 3*12 =36
f(3) = 3 * 36 = 108
