The conversion from yards to feet is based on the fact that 1 yard is equal to 3 feet. Therefore, to convert yards to feet, you can multiply the number of yards by 3.
In your case, we have the following information from the table:
- 2 yards = 6 feet (because 2 * 3 = 6)
- 5 yards = 15 feet (because 5 * 3 = 15)
- 7 yards = 21 feet (because 7 * 3 = 21)
Now, to find the missing value when 15 yards is converted to feet:
15 yards = 15 * 3 = 45 feet
So, the answer to the question "15 yards = ____ feet" is 45 feet.