The Adjacency Matrix a) Write out the adjacency Matrices for all the Tetris shapes. Draw vertices for every 1x1 block. (Not all matrices will be of the same dimension because some blocks will share more vertices than others.)

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?

Which is an x-intercept of the graphed function? (0, 4) (–1, 0) (4, 0) (0, –1)

What is the geometric mean of 3 and 7? a) square root of 21 b) 2 square root of 6 c) 2 square root of 7 d) 21