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QUESTION 3 If the demand equation is D(x) = 79 -1.65x and the supply equation is S(x)=0.71X 21, find the equilibrium price QUESTION 4 If the demand equation for an item is D(x) = -2.2x + 510 and a supplier is willing to supply 90 items at $700 per item, or 120 items at $2100 per item, find the equilibrium quantity, assuming linear supply and demand models