Which expression has three terms when simplified? 2xy
2 + xy
2x + x + y
2 + x + x - y

Samantha swam upstream for some distance in one hour. she then swam downstream the same river for the same distance in only 12 minutes. if the river flows at 4 mph, how fast can samantha swim in still water?

Using elimination, what is -4x+2y=-12 4x+8y=-24

Solve for x and select the correct answer