Question

The formula r=2√5L can be used to approximate the speed r, in miles per hour, of a car that has left skid marks of length L, in feet. How far will a car skid at 50 mph?

Answer 1

ok

Answer 2

\[50=2\sqrt{5}L\]

Answer 3

divide out the 2 so divide the right side and left side by 2

Answer 4

now you have
\[25=\sqrt{5}L\]

Answer 5

now you square 25 to get rid of the square root so you end up like this
\[625=5L\]

Answer 6

now divide out the 5 by dividing both sides by 5 and you get your answer of 125 feet