3) A third staircase in a swimming pool has a landing of 15 inches and a vertical rise of 12 inches per step. To the nearest degree, calculate the following measures (you must show all work to receive full credit):
a) What is the angle of elevation rounded to the nearest whole degree?

b) If the elevation of each step were changed to 10 inches and the landing became 7 inches,

what is the new angle of elevation for the staircase to the nearest whole degree?

I need help on this and I've tried doing it myself and what I've gotten is tan x=12/15 for a. I thought maybe I would divide 1

Question

3)  A third staircase in a swimming pool has a landing of 15 inches and a vertical rise of 12 inches per step.  To the nearest degree, calculate the following measures (you must show all work to receive full credit): 
​a) What is the angle of elevation rounded to the nearest whole degree?

​b)  If the elevation of each step were changed to 10 inches and the landing became 7 inches,

​what is the new angle of elevation for the staircase to the nearest whole degree?

I need help on this and I've tried doing it myself and what I've gotten is tan x=12/15 for a. I thought maybe I would divide 1