3 Precalculus

A hot-air balloon is rising vertically. The angle of elevation from a point on level ground 124 feet from the balloon to a point directly under the passenger compartment changes from 18" to 31.8". How far, to the nearest tenth of a foot, does the balloon rise during this period? 31 80 124 At feet (Round to the nearest tenth.)An aerial photographer who photographs real estate properties has determined that the best photo is taken at a height of approximately 493 it and a distance of 819 ft from the building. What is the angle of depression from the plane to the building? angle of depression 819 f 493 f angle of elevation The angle of depression from the plane to the building is. (Round to the nearest degree as needed.)A window washer on a ladder looks at a nearby building 124 it away, noting that the angle of elevation to the top of the building is 21.8 and the angle of depression to the bottom of the building is 7.20. How tall is the nearby building? 21.80 124 ft The building nearby is feet tall. (Round the final answer to the nearest foot as needed. Round all intermediate values to the nearest integer as needed.)