Question: An economic instructor told his class that the demand equation for a certain product is p=400-q^2 and its supply equation is p=20q+100. If the 400-q^2

An economic instructor told his class that the demand equation for a certain product is p=400-q^2 and its supply equation is p=20q+100. If the 400-q^2 is set equal to the 20q+100 the the positive solution to the resulting equation gives the "equilibrium quantity." The instructor asked his class to find this quantity. What answer should the class give?

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