SOLUTION: I have the answer to this problem, however, I need to know how the formula is calculated. Please advise and thank you! Find the rate of speed of a car that left a 150 feet skid

Algebra ->  Radicals -> SOLUTION: I have the answer to this problem, however, I need to know how the formula is calculated. Please advise and thank you! Find the rate of speed of a car that left a 150 feet skid       Log On


   

Question 260094: I have the answer to this problem, however, I need to know how the formula is calculated. Please advise and thank you!
Find the rate of speed of a car that left a 150 feet skid mark. Round to the nearest whole number and solve the formula for L.
r=2√5*L
r=55 and L=150
55=2√5(150)
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Find the rate of speed of a car that left a 150 feet skid mark. Round to the nearest whole number and solve the formula for L.
r=2√5*L
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L = r/(2sqrt(5)
L = 150/(2sqrt(5)
L = 75/sqrt(5
L = 75*sqrt(5)/5
L = 15*(sqrt(5))
L is approximately 33 mph
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Cheers,
Stan H.