So you're going to do to .5 * 10
The oatmeal bar that jennifer chose was bigger so one fourth of it was still bigger than Alex's
(n + 8) + (n - 12)
Get rid of the parenthesis.
n + 8 + n - 12
Note : the (12) turns into a negative because a negative times a positive is always a negative :)
Combine like terms.
(n + n) + (8 - 12)
Simplify.
2n - 4
~Hope I helped!~