Jaishree studies for five two by three hours daily. She devotes 2four by 5 hours of her time for scieand mathematics. how much time does she devote for other subjects?

How do you use the elimination method for this question? explain, because i really want to understand!

Abird on top of a 200 ft bridge tower sees a man standing on the lower part of the bridge (which is 50 ft above the ground). the angle of depression from the bird is 26 ̊. how far is the man from the base of the bridge tower? with explanation and pictures .

21 a stick 7 inches long is broken into two pieces, so that one piece is twice as long as the other one. how long are the two pieces?