Segment ab falls on line 6x + 3y = 12. segment cd falls on line 4x + 2y = 8. what is true about segments ab and cd?
they are parallel because they have the same slope of -2.
they are parallel because they have the same slope
they are coincident lines because they have the same slope and the same y-intercept.
they are coincident lines because they have the same slope and a different y-intercept.

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?