Question

Evaluate the expression 15 - n when n = 9

Answer 1

`15-n \hbox{ when } n=9 \\ 15-n=15-9=\boxed{6}`

Answer 2

To do this, you simply need to substitute in 9 for n in the expression.

15 - n
= 15 - (9)
= 6

Hope this helps! :)