Answer: 5d -17 can be used to represent the distance between Pittsburgh and St. Louis.
Explanation:
Given the distance between Pittsburgh, Pennsylvania, and St. Louis, Missouri, is 17 miles less than 5 times the distance between Pittsburgh and Cleveland, Ohio.
The distance between Pittsburgh and Cleveland = d.
it's "17 miles less than 5 times the d".
5 times of d is = 5d.
17 miles less than 5d = 5d -17.
Therefore, 5d -17 can be used to represent the distance between Pittsburgh and St. Louis.
