Three relationships are described below: I. The amount of fuel used on a trip increases as the size of the car increases and as the distance traveled increase II. As the number of people helping mow a lawn increases, the time it takes to mow the lawn decreases. III. The cost of having a house painted increases as the size of the house increases. What type of variation describes each relationship? OI is joint, II is inverse, and III is direct. OI is direct, II is inverse, and III is joint. OI is joint, II is direct, and III is inverse. I is direct, II is joint, and III is inverse.