Question

A sequence is defined by the recursive formula f (n + 1) = f(n) – 2. If f(1) = 18, what is f(5)?

Answer 1

f (n + 1) = f(n) – 2 means that you keep subtracting 2 to get the next number in the sequence.

f(1) = 18
f(2) = 18 - 2 = 16
and so on

Answer 2

I got 13

Answer 3

I got 13 as well but the actual answer is 10 @thanksten

Answer 4

how did you guys get 13?
f(1) = 18
f(2) = 18 - 2 = 16
f(3) = 16 - 2 = 14
f(4) = 14 - 2 = 12
f(5) = 12 - 2 = 10

Answer 5

Ohhhh,sorry I got 10 too

Answer 6

Thanks@peachpi