Help me please i need this answered fast

Alake near the arctic circle is covered by a sheet of ice during the cold winter months. when spring arrives, the ice starts to melt. s(t) models the ice sheet's thickness (in meters) as a function of time tt (in weeks). s(t)=-0.25t+4

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What is the average rate of change for this function for the interval from x=2 to x=4 ?