Consider the function below. (Give your answers correct to 2 decimal places.)

f(x) = (5 x+8)/(2 x**2)

(a) Find the critical numbers of f (if any). If there are no critical numbers, enter NONE.

(b) Find the open interval on which the function is increasing. (If you need to enter or -, type INFINITY or -INFINITY.) ( )

(c) Find the open intervals on which the function is decreasing. (If you need to enter or -, type INFINITY or -INFINITY.) ( , ) (leftmost interval, smaller x value) ( , ) (rightmost interval, larger x value)

(d) Apply the First Derivative Test to identify the relative extremum. ( , )