4) For a recent year, the rate of first class postage was as follows:

Weight | Price

1 oz. | $0.44

2 oz. | $0.61

3 oz. | $0.78

3.5 oz. | $0.95

A. write piecewise-defined function to model the cost of C(x) to mail a letter first class if the letter has x ounces

B. Graph the function

C. Find the cost to mail a letter that is 3.48 oz.