Question

PLZ HELP!!!!!
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 20 mph?

The car will skid ? feet.

Answer 1

\[2\sqrt{5L}=r\]
\[\sqrt{5L}=r/2\]
\[5L=r^2/4\]
\[L=r^2/20\]
Plugging in 20 mph for r, L=20 m.

Answer 2

sorry 20 feet

Answer 3

OK? SO THE ANSWER IS...?

Answer 4

Just used to working in metric...

Answer 5

?

Answer 6

The answer is 20 feet...

Answer 7

THANK YOU