sabrina: 10(c+2)when c=9
It's really simple, you only need the priority of your operation...
First of all, you have to do what's in the (), so it's 9+2 = 11
After that, you have to do the multiplication 10 * 11 = 110
Or, when it's simple like this one, you could do 10 * 9 + 10 * 2
+142 
