Answer:
C-5 feet
Explanation:
If the area is 15, and the width is 3, we need to find the length with the info we have. And we know, to find the area, we need to multiply the length and the width. What number times 3 can get us to 15? Let's find out by dividing.
15/3=5
How to check? Use inverse operations:
3*5=15