this is question with multiple choice. It will be on file please

Question 7 Refer to the graph below. If the price is changed from $12.00 to $4.00, the quantity demanded increases by 4 units. $24.00 - $20.00- - Demand $16.00 - - $12.00 -- $8.00 $4.00 - $0.00+ 2 3 4 5 Quantity 8 9 1 O True O False Question 8 Price TIT B ATC P=MR AVC 1 2 3 4 5 6 7 8 9 10 11 12 Quantity Refer to the graph above. What is this perfectly competitive firm's profit maximizing level of output? 0 9 units O 10 units 0 7 units 0 8 units Question 9 The law of supply states that, other things remaining the same, O demand increases when supply increases O if the price of a good increases, the quantity supplied increases O if the price of a good increases, firms buy less of it O as people's incomes increase, the supply of goods increases Question 10 The opportunity cost of going to college O includes wages you lose by going to school instead of working O is the same for all students at a particular school who pay full tuition O is equal to the cost of tuition, room and board, and other expenses O is zero if your parents pay your tuition Question 11 Which of the following is an example of a product that is nonexcludable and rivalrous? O flu vaccinations O automobiles O national defense it (with limited seating) in a park