9. let x = {1, 2, 3}, y = {1, 2, 3, 4}, and z = {1, 2}. a. define a function f : x → y that is one-to-one but not onto. b. define a function g: x → z that is onto but not one- to-one. c. define a function h: x → x that is neither one-to-one nor onto. d. define a function k: x → x that is one-to-one and onto but is not the identity function on x.

Question 7 of 47 1 point what is the equation of a line with a slope of 1/2 that passes through the point, (-2,5)? o a. 1/2x+3 o b. y=1/2x+5 o c. y=x+5 o d. y=1/2x+6

8. kelly wants to buy a magazine that is $25. later the magazine was marked up an additional 20%. what is the new price?

In a test for esp (extrasensory perception), a subject is told that cards only the experimenter can see contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. a subject who is just guessing has probability 0.25 of guessing correctly on each card. a. the count of correct guesses in 20 cards has a binomial distribution. what are n and p? b. what is the mean number of correct guesses in 20 cards for subjects who are just guessing? c. what is the probability of exactly 5 correct guesses in 20 cards if a subject is just guessing?