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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 f(2.4) and f(S). Interpret your results. (b) Sketch a graph off. What is the domain off? What is the range off? (a) f(24) 136 (Type an integer or a decimal.) f(S)= 1.82 (Type an integer or a decimal) Interpret and f(5). It costs to mail 24 oz and to mail 5 oz. 0 80 113 126 189 182 if0