Can anyone help me with this geometry question? I just don't know what is the last step, we are trying to prove that BD bisects angle ADC

An ulcer medication has 300 milligrams in 2 tablets. how many milligrams are in 3 tablets?

Two cars which are 40 miles apart start moving simultaneously in the same direction with constant speeds. if the speed of the car which is behind is 56 mph and the speed of the other car is 48 mph, how many hours will it take for the car which is behind to catch up the car ahead of it?

Yesterday, george drank 1 small bottle and 2 large bottles, for a total of 1,372 grams. the day before , he drank 1 small bottle and 1 large bottle, for the total of 858 grams. how many grams does each bottle hold?