Final answer:
The perimeter of the rectangle-shaped rink with a length of 390 feet and a width of 85 feet is 950 feet.
Step-by-step explanation:
To find the perimeter of the rink, which is in the shape of a rectangle with a length of 390 feet and a width of 85 feet, we need to use the formula for the perimeter of a rectangle. The perimeter (P) can be calculated as P = 2×(length + width). Therefore, we plug in our values to get P = 2×(390 feet + 85 feet). This gives us P = 2×(475 feet), which simplifies to P = 950 feet.