Question

The demand function qd=f(p) for a product is quadratic. Three points which lie on the
function are (10, 2,700), (20,1,200), and (30, 300). Determine the equation for the demand function. What quantity will be demanded at a market price of $5?
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Answer 1

Answer:

sorry I had no time to read the question becoz it's so bigg so sorry I can't answer the question