Hey, So I've been working on a physics project and I'm trying to understand force. This website has all my answers http://www.myphysicslab.com/collision.html but I don't understand with they use commas. For example (Rx, Ry, 0) × (Tx, Ty, 0) = (0, 0, RxTy − RyTx). Now it is dealing with vectors for example F = (Fx, Fy). I think maybe even 3 dimensional victors. But how do I use this? How do I find X? Can someone point me somewhere?