Question: The demand for a particular commodity is given by D(x) = -35x + 150; that is, x units will be sold (demanded) at a price

The demand for a particular commodity is given by D(x) =
-35x + 150; that is, x units will be sold (demanded) at

The demand for a particular commodity is given by D(x) = -35x + 150; that is, x units will be sold (demanded) at a price of p= D(x) dollars per unit. Consumer expenditure E(x) is the total amount of money consumers pay to buy x units. Use calculus to find the instantaneous rate of change of expenditure with respect to x when x = 6. Is expenditure increasing or decreasing when x = 6?

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