Find the area of an isosceles trapezoid that has bases with lengths of 20 and 30 and legs of length 13

The quadratic function h(t) = -16.1t^2 + 150 models a balls height, in feet, over time, in seconds, after its dropped from a 15 story building. from what height in feet was the ball dropped?

A20? -foot ladder is placed against a vertical wall of a? building, with the bottom of the ladder standing on level ground 19 feet from the base of the building. how high up the wall does the ladder? reach?

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.