anonymous one year ago LAW ENFORCEMENT:  A police accident investigator can use the formula S25L to estimate the speed s of a car in miles per hour based on the length l in feet of the skid marks it left.  How fast was a car traveling that left skid marks 105 feet long?

1. anonymous

2. calculusxy

So is the formula: S = 25L

3. anonymous

It's s=2sqrt5l @calculusxy

4. calculusxy

$S = 2\sqrt{5l}$

5. calculusxy

Is that correct?

6. anonymous

Yes @calculusky

7. calculusxy

Okay!

8. calculusxy

You know that the skid mark left is 105 feet, and you can replace that for L. Thus, what you have here is now: $S = 2\sqrt{5(105)}$

9. calculusxy

Did you solve for it?

10. anonymous

I got 2sqrt525 @calculusxy

11. anonymous

I'm not good at solving square roots

12. anonymous