It is known that quantity demanded decreases by two units for each $1 increase in price. At a price of $5, quantity demanded is ten units.

It is known that quantity demanded decreases by two units for each $1 increase in price. At a price of $5, quantity demanded is ten units.
a) What will be the quantity demanded is price is zero?
b) Write and equation for quantity demanded as a function of price.
c) Write an equation that expresses price as a function of quantity.
d) Write an equation for total revenue.
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