Use the slope formula to find the slope that passes through the points : (-4, 10) and (2,-8)

Asap! i'm not good math and i'm lost.

How do you figure out which order to do two step equations in? like which thing do you subtract/add/multiply/divide first? i understand that you do the opposite of whatever's shown on the opposite side, but when?

Ahummingbird lives in a nest that is 15 feet high in a tree.the hummingbird flies 17 feet to get from its nest to a flower on the ground.how far is the flower from the base of the tree?