Just a yes or no. It would help to know why, also. 1. f(d) is the number of orange woolen hats sold at a department store on the dth day after September 1, 2003. 2. f(w) is the cost of mailing a letter weighing w grams. 3. f(t) is the total accumulated rainfall in inches t minutes into a sudden rainstorm in July, 2005. I thought the answers were no, yes, no, respectively, because the first and third instances deal with particular instances, but, apparently, I'm wrong. Any help?