



 
Hi Christy. You are starting with the relationship: So the first step is to take the derivative with respect to time t on each side of the equation: Now do the derivation, first using the product rule: The last step is to substitute in the known values. You are asked to find dV/dt when C is 5 ft, dC/dt is 0.2 ft/yr and dH/dt is 4 ft/yr. So now you can just substitute these in to find your answer. Cheers,  


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