Question

The formula r=2√5L can be used to approximate the speed r, in MPH of a car that left skid marks of length L, in feet. How far will a car skid at 20 mph?

Answer 1

what you do is set r to be 20 like so,
\[20=2\sqrt{5L}\]
and solve for L

Answer 2

Got it. The answer is 20 :)

Answer 3

you got it

Answer 4

if you read the problem r = the speed of the car

Answer 5

no, not 75 feet