anonymous 5 years ago The formula r=2sqrt(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?

1. anonymous

$20 = 2 \sqrt{5L}$$10 = \sqrt {5L}$$10^{2} = 5L$$L = 100/5 = 20$

2. anonymous

So how many feet is it? 100/5?

3. anonymous

transform 20 mi into feet 20 mi = 105 600 feet

4. anonymous

okay, what do i do next?

5. anonymous

6. anonymous

105 600 feet is my answer?

7. anonymous

a car that has left skid marks of length L, in feet. How far will a car skid at 20 mph? -> 20 mi = 105 600 feet

8. anonymous

Ok, thank you.

9. anonymous

np

10. anonymous