Answer:
-2 or 17
Step-by-step explanation:
The range is the difference between the smallest number and the largest number. Currently, the smallest number is 2 and the largest number is 13.
If we leave 2 as the smallest number, then the new largest number needed for the range to be 15 is:
x − 2 = 15
x = 17
If we leave 13 as the largest number, then the new smallest number needed for the range to be 15 is:
13 − x = 15
x = -2
The number could be either -2 or 17.
