Question 567354
Hilly areas often have road signs giving the percentage grade for the road. A 5% grade, for example, means that the altitude changes by 5 feet for each 100 feet of horizontal distance.
Suppose an uphill road sign indicates a road grade of 3%. What is the angle of elevation of the road? 
A 3% grade means the altitude changes by 3 feet for each 100 feet.
Applying trigonometry,
tan x = 3/100
tan x = .03
x = 1.72 degrees