Observer (o) spots a plane flying at a 42° angle to his horizontal line of sight. if the plane is flying at an altitude of 15,000 ft., what is the distance (x) from the plane (p) to the observer (o)?

The distance from the plane to the observer is 13,506.06 ft. In the problem, the given values are 15,000 ft altitude of the plane and its opposite angle which is 42°.

x = 15,000 ft. * tan(42) = 13,506.06 ft

Letter a, because when there are unlike charges they will always attract to each other.

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.