Hi, Eswoody01! :)
To remove the parenthesis, we must distribute them:


Simplify.

This is the most you can simplify this expression.
Hope this helps.
-Benjamin
It should be 15 because 48/3.2 is 15 and that means he swam 48 kilometers in 15 days
So, there are 1, 5, 10, 25 and 50 cent coins.
The most logical combination would be a dime and a quarter (10 + 25 = 35) but it is said that "one of the coins is not a dime".
But, there is something many people don't notice. It says that one of the coins isn't a dime, but the other one can be a dime. So, the two coins are a quarter and a dime.
Hope it helped,
BioTeacher101