A demand curve shows the quantity demanded of a product at each price.
<h3>What is a demand curve?</h3>
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A demand curve simply means a graphical representation of the relationship between price and quantity demanded.
In this case, a demand curve shows the quantity demanded of a product at each price. The profit maximizing price is when the marginal cost equals marginal revenue.
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Answer:
The slope of problem 11 is

The slope of problem 10 is

Sense the two triangles are congruent you would use CPCTC.