please solve

0.50 if0

The retail flat rate in dollars for first-class mail weighing up to 5 ounces could be computed by the piecewise-constant function f, where x is the number of ounces. f(x) (a) Evaluate (0.5) and f(3) Interpret your results. (b) Sketch a graph off. What is the domain off? What is the range off? (a) f(0E) (Type an integer or a decimal.) f(3) (Type an integer or a decimal.) Interpret and f(3). It costs to mail 08 oz and to mail 3 oz. 066 082 0 98 114 if0