Question: according to the americans with disabilities act a ramp cannot...

According to the Americans with Disabilities Act, a ramp cannot have an incline that is greater than 5^o. The regulations also state that the maximum rise of a ramp is 30 inches. When a 
ramp needs to reach a height greater than 30 inches, a series of ramps connected by 60-inch landings can be used, as shown below.

a) What is the maximum horizontal length of the base of one ramp, in feet? Round to the nearest foot

length = ____ feet

b) If a doorway is 7.5 feet above the ground, what is the least number of
 ramps and landings you will need to lead to the doorway?

fewest ramps = _____

fewest landings = ______