A graph with a positive slope indicates that as one variable increases, the other variable also increases.
The scenario "the amount of money that someone makes at a job over the course of a week" would create a graph with a positive slope. This is because, generally, as time progresses (over the week), the amount of money earned would accumulate, resulting in an upward trend.
The other scenarios—speed of a person sitting still, a person going down a waterslide (elevation decreases), and an airplane landing (elevation decreases)—would not create a positive slope.
Therefore, the correct answer is: the amount of money that someone makes at a job over the course of a week.