Recall that in business, a demand function expresses the quantity of a commodity demanded as a function of the commodity's unit price. A supply function expresses the quantity of a commodity
supplied as a function of the commodity's unit price. When the quantity produced and supplied is equal to the quantity demanded, then we have what is called market equilibrium.
The demand function for a certain compact disc is given by the function p= -0.01x²-0.5x+7 and the corresponding supply function is given by p=0.01x² -0.1x+1, where p is in dollars and x is in
thousands of units.