A function $\,f\,$ increases on an interval $\,I\,$ if and only if whenever $\,a < b\,$ in $\,I\,$, $\,f(a) < f(b)\,$. 

A function $\,f\,$ decreases on an interval $\,I\,$ if and only if whenever $\,a < b\,$ in $\,I\,$, $\,f(a) > f(b)\,$. 
On this exercise, you will not key in your answer. However, you can check to see if your answer is correct. 
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