For http://webwork.rutgers.edu/webwork2_...c3cd9e6781.png the function http://webwork.rutgers.edu/webwork2_...faee426371.png is defined by On which two intervals is the function increasing

I got -11 to 6 as one interval

and only part of the other one which is (some # to 10)

What is the "some #" please help this is due tonight. thank you