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Mathematics 14 Online
OpenStudy (anonymous):

The distance a cyclist has traveled is given by the function s(t)=-2t^3+12t^2 where 0 is less than or equal to t less than or equal to 4 her time measured in hours while s(t) is measured in miles. what was her average speed after a half an hour of riding until 2 hours and 15 mintues later? Exactly how fast was she riding after an hour and a half ?

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