Final answer:
Johann is correct in connecting the points on a graph to represent the total revenue for different numbers of vehicles as it forms a linear and continuous function.
Step-by-step explanation:
In the scenario presented, Johann is correct because connecting the points shows the total revenue for different numbers of vehicles. To explain further, this situation forms a linear relationship, as every additional vehicle brings in a constant additional revenue of $20. Therefore, plotting the points on a graph and connecting them illustrates how revenue increases linearly with each additional vehicle. The resulting line would be straight, and each point on the line corresponds to the total revenue for a particular number of vehicles. On the other hand, if the charge per vehicle were to vary or if there were restrictions on the number of vehicles allowed, the points should not be connected because it would not represent a continuous function.