You have a rope that is 129.25 inches long. you cut off 6 pieces from the rope. each piece is 18.5 inches long. how long is the rope after you cut off the 6pieces

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

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?