Some economics questions for a quiz, help would be much appreciated!!?

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john

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1. Suppose the demand curve for pizza can be represented by the equation:
QD = 20 - 2P,
where QD is the quantity demanded and P is the price.
The supply curve for pizza can be represented by the equation
QS = P - 1,
where QS is the quantity supplied.

The initial equilibrium price of pizza is $ _____.

2. Suppose the demand curve for pizza can be represented by the equation:
QD = 20 - 2P,
where QD is the quantity demanded and P is the price.
The supply curve for pizza can be represented by the equation
QS = P - 1,
where QS is the quantity supplied.

The initial equilibrium quantity of pizza is _____ pizzas.

3. Suppose the demand curve for pizza can be represented by the equation:
QD = 20 - 2P,
where QD is the quantity demanded and P is the price.
The supply curve for pizza can be represented by the equation
QS = P - 1,
where QS is the quantity supplied.

Suppose the government imposes a tax of $3 per pizza.

The new equilibrium price of pizza is $
 
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