They model various situations where there is an increasing curve. An example is if you throw a baseball and it curves back down as gravity has more and more of a affect on it. This would be a different equation than if you threw a basketball as the basketball wouldn't go as high but would have about the same downwards acceleration due to gravity.
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1/2 hour = 105 miles
Divide by 1/2 on both sides :
1/4 hour = 52.5 miles
1. (x-7)(x-4)
2. (x-12)(x+7)
use foil to check your work
1758.4 yards because you multiply 280 by two and by pi
