Question

Given `N(p)=60p-p^2`, how do you find N(9)?

Answer 1

Substitute `color(red)(9)` for each occurrence of `color(red)(p)` in the function. See below for full process.

Explanation:

Given `N(color(red)(p)) = 60color(red)(p) - color(red)(p)^2`

The

`N(color(red)(9)) = (60 xx color(red)(9)) - color(red)(9)^2`

`N(color(red)(9)) = 540 - 81`

`N(color(red)(9)) = 459`