Corrine has 9.6 pounds of trial mix to divide into 12 bags. how many pounds of trial mix will go in each bag

Two airplanes start at the same place and travel in opposite directions,one at 395 miles per hour and the other at 422 miles per hour. how many hours will it take for the planes to be 2451 miles apart?

Could someone me with this question i’ve been stuck on it for 20 minutes

To prove a polygon is a rectangle, which of the properties listed must be included in the proof?