I'm having some trouble in my Pre-Al class and was wondering if anyone can help me. When you do the KCO method or Keep, Change, Opposite (example if the problem is 3+4, ypu keep the 3, change the + to a minus, and change 4 to -4. So it would be 3 - (-4) I know that problem is proabably not right so you see my dilemma!! (lol). Please help me!!!!