A boat is 1000 meters from the base of a cliff. If the angle of depression from the top of the cliff to the boat is 15º, how tall is the cliff? Round your answer to the nearest tenth.

Find the equation of the ellipse with the following properties. the ellipse with foci at (0, 6) and (0, -6); y-intercepts (0, 8) and (0, -8).edit: the answer is x^2 over 28 + y^2 over 64 = 1

Perry observes the opposite parallel walls of a room in how many lines do the plains containing the walls intersect

In a tutoring session, 2/3 of an hour was spent reviewing math problems. adelina attended 3/4 of the tutoring session. how much time did adelina spend at the tutoring session?