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

10!

Explanation:

Answer 2

`f(5)=10`

Explanation:

A sequence is defined by the recursive formula
`f(n+1)=f(n)-2`

If
`f(1)=18,` then

for
`n=1: f(2)=f(1+1)=f(1)-2=18-2=16`

for
`n=2: f(3)=f(2+1)=f(2)-2=16-2=14`

for
`n=3: f(4)=f(3+1)=f(3)-2=14-2=12`

for
`n=4: f(5)=f(4+1)=f(4)-2=12-2=10`