Ihave a math problem that is stumping me and other people. do you always multiple before dividing or do you work left to right?

Which expression is equivalent to 2x^2+2x-4/2x^2-4x+2

Maria walks a round trip of 0.75 mile to school every day. how many miles will she walk in 4.5 days

An observer(o) spots a plane(p) taking off from a local airport and flying at a 29 degree angle horizontal to her line of sight and located directly above a tower(t). the observer also notices a bird circling directly above her. if the distance from the plane(p) to the tower(t) is 6,000ft., how far is the bird(b) from the plane(p).