Question 978668
If x is the missing third side, then


7-6 < x < 7+6


1 < x < 13


So the third side must be between 1 and 13 units. It cannot equal 1 and it cannot equal 13.


The only answer that fits in this interval is <font color="red">II. 5</font> which  is the final answer. The other values are outside of this interval.