A car's displacement from home is measured in miles by the the function d(t) = (t-2)(t-12), where t is measured in minutes. Which option represents all times that the car is at least 21 miles from home? a) At 2 minutes and 12 minutes b) Between 2 and 12 minutes c) Less than 2 minutes d) After 13.8 minutes e) Answer is not there

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A:

Rate of Change

The relation between two quantities which displays how much greater one quantity is than another is called ratio.

Slope

The change in the vertical distances is known as the rise and the change in the horizontal distances is known as the run. So, the rise divided by run is nothing but a slope value. It is calculated with simple algebraic equations as: