pleaseee helpp!! A plane departs from the Atlanta airport. When the plane is 300 meters off the ground it has traveled 400 meters horizontally away from the airport. At what angle did the plane take off? Round to the nearest tenth (0.1).

Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

If there is 20 dogs in the shelter and 5 dogs get homes, and then 43 more dogs come. how many dogs are there in the shelter?