The height of building ab is 100 feet. the height of building cd is 50 feet. the buildings are on opposite sides of an avenue that is 90 feet wide. from a point e on the avenue, the measure of the angle of elevation to b is 55 degrees. determine the distance from e to a to the nearest foot

Anew obstacle course is home to several new types of challenging obstacles. one such obstacle is traversing a 15-stair staircase. to make it more challenging, the stairs are not uniformly spaced. rather, the vertical space between consecutive stairs for the first 10 stairs is 113 feet and the vertical space for the last 5 stairs is 134 feet. what is the total vertical distance traveled ascending and descending the entire 15-stair staircase?