Problems
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- Determine the average speed of a car between an hour and a half and a half hour after it starts a trip when its distance-time function is $d(t)=t^3-15t^2+75t$.
- Determine the instantaneous speed of a car three quarters of an hour after starting on a trip where its distance-time function is $d(t)=t^3-15t^2+75t$.
