Pre algebra problems. Can anyone be so kind and help?

S=5.5(square root sign)0.7L
S=5.5(square root sign)0.8L

using those ^^^^ can you help answer these questions?

You can find the approximate speed of a vehicle that leaves skid marks before it stops. The two formulas where S is the speed in miles per hour and L is the length of the skid marks in feet, will give the minimum and maximum speeds that the vehicle was traveling before the brakes were applied. Be sure to round to the nearest mile per hour.
A vehicle leaves a skid mark of 100 feet before stopping. What was the approximate speed of the vehicle before it stopped?

You can find the approximate speed of a vehicle that leaves skid marks before it stops. The two formulas, where S is the speed in miles per hour and L is the length of the skid marks in feet, will give the minimum and maximum speeds that the vehicle was traveling before the brakes were applied. Be sure to round to the nearest mile per hour.
A vehicle leaves a skid mark of 40 feet before stopping. What was the approximate speed of the vehicle before it stopped?
 
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