F(-1) = 1. This is because the blue, filled in circle is at a y-value of 1 when you look at the graph at x= -1 . Disregard the empty circle because it represents an inequality that excludes that value. They exlude that value because they have one of these symbols in their inequality [tex] \neq [/tex] , < , > . Whereas, the filled in circles include that x-value because their inequalities have either = , [tex] \leq [/tex] , or [tex] \geq [/tex] . Does that make sense? comment back with any further questions.
