Answer:
C). (7,13)
Explanation:
When you see an open circle on the number line, this means the number the circle is above is EXCLUDED in the interval.
When a number is excluded, you use a parenthesis ( )
A filled-in circle on the graph means the number is INCLUDED
When a number is included, you use a bracket [ ]
On the number line, there is an open circle above the 7 and the 13
This means 7 and 13 are not included in the interval, so there will be a parenthesis on BOTH SIDES.
Final Answer: ( 7, 13 )