12. Functions can be written as a. ordered pairs b. tables c. graphs d. all of the choices 13. Let A = {10, 20, 30] and B = {Pandesal, Yema Cake, Mamon, Ensaymada). Which of the following is a one-to-one function? a. {(10,pandesal),(20, Mamon), (30,Pandesal)) b. {(10, Yema Cake), (20, Ensaymada), (30,pandesal)} c. {(10,pandesal), (20,pandesal), (30,pandesal)} d. {(10, Mamon), (20, Yema Cake), (10, Pandesal), (30, Ensaymada)} 14-15. Below are the statements that may represent real life situation using one-to-one function. i. One person has one passport. ii. A shoe has one place on which you would wear it (yourfoot). iii. Paper has one source. iv. A washing machine has two function (to wash) 14. Which of the following is not included? a. i only b. ii and iii only c. iii and iv d. iv only 15. Which of the following is an example of one-to-one function? a. i and ii b. ii and iv c. iii and iv d. i and iv