How would you graph the solution set of x - 6 < -3?

a: Draw an open circle on -9 and shade to the left.
b: Draw a closed circle on -9 and shade to the left.
c: Draw a closed circle on 3 and shade to the left.
d: Draw an open circle on 3 and shade to the left.

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?