my answers are wrong, please help:

Question 14 1 points Saved Which one of the following would cause the demand for pizzas among college students to shift to the right? An increase in financial aid to college students. O Half-price pizzas for anyone with a college ID. An increase in the price of a complement, i.e. Coke. A decrease in the price of a substitute such as chicken burgers.Question 5 Which one of the following defines the term "market failure"? O Income distribution is not equitable. Externalities are present in the economy The best attainable outcome has not been achieved The economy is not in equilibrium.Question 10 Which one of the following describes when a rational person will act? When the action is ethical. When the actions makes money for the person. When the action produces marginal costs that exceed marginal benefits. When the action produces marginal benefits that exceed marginal costs- O OS Library Memories People Places Favorites Recents Imports Recently Deleted Question 15 Media Types The supply curve for a good shows the seller's: Target price. Shared Albums Minimum acceptable price. Maximum acceptable price. My Albums Inventories of finished products. My ProjectsOctober 20 Question 17 If buyers believe that the price of gasoline will rise soon, which one of the following is the most likely immediate result? O An increase in the quantity demanded, due to change in supply. A decrease (shift to the left) in the demand for gasoline, due to a change in tastes An increase (shift to the right) in the demand for gasoline, due to a change in expectations A decrease (shift to the left) in the demand for gasoline due to a shift to substitutes