Posted by Rock on Sunday, December 4, 2011 at 7:20pm.
Help w/Word Prob: LAW ENFORCEMENT A police accident investigator can use the formula s=2√5l 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 120 feet long?

Alg2  MathMate, Sunday, December 4, 2011 at 9:07pm
s(L)=2√(5L)
Substitute L=120 in above equation to get:
s(120)=2√(5(120))
=2√(600)
=2*24.5
=49 mph 
Alg2  Rock, Sunday, December 4, 2011 at 9:49pm
I can See It!!! I was multiplying 600 & 2 together... Thanks :)

Alg2  MathMate, Sunday, December 4, 2011 at 10:08pm
You're welcome!