May i get help solving the following questions

1. The observer looks up at the plane with an angle of elevation of 48, and looks down to the car at angle of depression of 350. Both the car and plane are at a horizontal distance of 150 feet. What is the height of the plane? Show all your work step by step. Observer located Line of sight above observer here Angle of elevation Horizontal Angle of depression Line of sight below observer 2. Carefully explain the steps for finding the reference angle for 240. Then calculate sin2400