1. The problem statement, all variables and given/known data Postal charges are $.25 for the first ounce and $.20 for each additional ounce or fraction thereof. Let c be the cost function for mailing a letter weighing w ounces. a) Is c a continuous function? What is the domain? b) What is c(1.9)? c(2.01)? c(2.89)? c) Graph the function c. 2. Relevant equations 3. The attempt at a solution For a I got: No. The domain is all real numbers > 0. B is where I get stuck, I understand the question it's just I cant get what the integer function would be.. C I could do once I have b..