Suppose that the number of worker-hours required to distribute new telephone books to x% of the households in a certain rural community is given by the function W(X) = 600 x 300-x a. What is the domain of the function W? b. How many worker-hours were required to distribute new telephone books to the first 50% of the households? c. How many worker-hours were required to distribute new telephone books to the entire community? d. What percentage of the households in the community had received new telephone books by the time 150 worker-hours had been expended