Answer:
7 yards.
Explanation:
Assuming both Richard (1,3) and Marlon (-6,3) are on the same altitude/y-axis, we can simply do a addition/subtraction equation to solve this problem. Using both x-axis coordinates, we setup -6 - 1. In turn, we get -7, since one cannot throw something in negative yards, we turn it into a positive. Finally, we get 7 yards in total.