Absolute value inequalities Exercises

Created some exercises for the Absolute Inequalities video. 
    Three problem types:
        -Simple Inequality with no x-shift using a number line.
           -- Student must outline a range on an interactive numberline that is the solution to an inequality.
       - Inequality with x-shift using a number line.
       - Inequality with x-shift and scalars algebraically.
          -- Student must solve an inequality and enter the rational solutions.   

Added a util file which contains some helpers for drawing and making interactive numberline segments.