Skis at a sports store near snow summit are on sale for $476. if the original price was $560, what discount rate does this represent? %

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

Which shows the correct substitution of the values a, b and c from the equation 1=-2x+3x^2+1

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?