Geometry (16) the lengths of the sides of a sandbox are 9ft, 6ft and n ft. write a compound inequality that describes all possible lengths of n.

A = 9 and b = 6 are the two given sides

The third missing side n can be described through the following inequality
a-b < n < a+b
where a > b ('a' is larger than b)
This is the triangle inequality theorem

So,
a-b < n < a+b
9-6 < n < 9+6
3 < n < 15

3 < n < 15
(which means you can pick any number from 3 to 15 for n. You cannot pick 3. You cannot pick 15)

The answer to your question is the last one

Istg idk..if there all the same length there all the same number but use google