Which of the following statements are true about E-R diagrams? I. Entities and relationships are mapped to tables in the database.

II. E-R diagrams are useful for creating the initial set of normalized tables in the database.

III. An entity describes the association between two real-world objects.

IV. An E-R diagram is also known as the entity-relationship diagram.

I, II, III

I, II, IV

I, III, IV

II, III, IV

1. which one of the following would be an example of a supply-side market failure? a. a gas station is slowly leaking diesel fuel from its underground tanks, and after the leak is discovered, the business immediately cleans up the pollution at its own expense. b. a gas station is slowly leaking diesel fuel from its underground tanks, but the state uses taxpayer money to clean up the pollution rather than requiring the business to pay. c. your business wants to attract repeat customers by putting on a customer-appreciation picnic at a public park, but you decide not to because you couldn't prevent noncustomers from consuming the food and entertainment you provided. d. everyone rushes to the local retail outlet at midnight on the day of the release of a new video game console, and the store runs out before everyone is able to buy one.

Most economists report the elasticity of demand asa. the absolute value of the actual number.b. a negative number, since price and quantity demanded move in opposite directions.c. a percentage, since both the numerator and denominator are percentages.d. a dollar amount, since we are measuring the change in price.

Perry is a freshman, he estimates that the cost of tuition, books, room and board, transportation, and other incidentals will be $30000 this year. he expects these costs to rise about $1500 each year while he is in college. if it will take him 5 years to earn his bs, what is the present cost of his degree at an interest rate of 6%? if he earns and extra $10000 annually for 40 years, what is the present worth of his degree.?