3) A staircase of steps in a swimming pool has a vertical rise of 15 inches per step and a landing of 19 inches. Answer the following questions showing each step of your work:
a) What is the angle of elevation (rounded to the nearest whole degree)?
b) If the landing of each step is changed to 16 inches and the elevation of each step to 22 inches, what is the new angle of elevation for the staircase (rounded to the nearest whole degree)?