Which function has an inverse that is also a function?

Bella want to know what the students at her school think of her show. which is the best group to survey to find this information a. go to the mall and ask all of the students she recognizes from school b. ask her viewers to call in durning an episode of the show c. get a list of students at her school from the office and use a random number generator to pick 30 of them d. get a list of students at her school from the office and pick the first 30 students on the list

Find two numbers if their sum is 91 and the ratio is 6: 7?

We have 339 ounces of jam to be divided up equally for 12 people how muny ounces will each person get