an airplane is flying at an altitude of 30,252 feet. The plane prepares to land and descends 2/3 of it's height. enter the altitude, in feet. of the airplane after the descension

Which one ? is the answer and how to find this answer

1) in triangle the, what is the measure of angle t (in degrees)? 2) in triangle bat, the measure of angle b is 66∘, and the measure of angle t is 77∘.what is the measure of the exterior angle at a (in degrees)?

3x = 729 solve for x plz . it's urgent. will mark