The function D (t) = 13t^2 to the second power – 120t gives the distance a car going a certain speed will skid in t seconds. Find the time it would take for the car to skid 170 feet.
The time to skid 170 feet is __________ seconds.
170=13t^2-120t
solve the quadratic...
t=(120+-sqrt(120^2+4*170))/26