Answer:
the demand quantity and the supply quantity at a price of $15 is 8 units
Step-by-step explanation:
Supply, P = 1/4 Q²
Demand, P = - 1/4 Q²+30
If P = 15
Quantity Demanded will be 15 = -0.25Q²+30;
if we move 30 across the equality sign.
Therefore -0.25Q²=-15; divide both sides by -0.25;
Q² = 60, Q = 7.746, approximately 8 units
Quantity Supplied will be 15 = 1/4 Q², dividing both sides by 1/4
Q² = 60, Q = 7.746, approximately 8.