What is the y-value when x equals 30?
y = 350 - 25(x)

The sum of two numbers is 86, and their difference is 20. find the two numbers

Which inequality is equivalent to -3x < -12? x < 4 , x < -4 , x > 4, x > -4

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?