After an accident, police can estimate the speed that a car was traveling by measuring its skid marks. The formula r=2√5L can be used, where r is the speed in miles per hour and L is the length of the skid marks in feet. Estimate the speed of a car that left skid marks:
a) 30 ft long?
b) 140 ft long?
c) 250 ft long?

Question

anonymous · Answer

all you have to do, is plug in 30 for L
"                                         " 140 for L
"                                          "  250 for L
in the formula: $$R(L)=2\sqrt{5L}$$