In a survey of employees at a fast food restaurant, it was determined that 12 cooked food, 9 washed dishes, 18 operated the cash register, 5 cooked food and washed dishes, 5 cooked food and operated the cash register, 7 washed dishes and operated the cash register, 4 did all three jobs, and 4 did none of these jobs. Complete parts a) through f) below.