Mai runs around a 400 meter track at a constant speed of 250 meters per minute. how many minutes does it take mai to complete 4 laps on the track? explain or show your reasoning

How do you find the circumfrance of a circle?

Can someone me out here number 4 plz

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).