6) Draw graphs of the following relationships (Hint: first decide which variable is dependent/Independent, then consider the relationship between the variables)

(a) Lecture time and attention span, all else equal

(b) A firm's costs and profits, all else equal

(c) Economic output (production) and the level of capital, all else equal

(d) The long-term cost of gasoline and the number of Sports Utility Vehicles (SUVS) on the road