Click an item in the list or group of pictures at the bottom of the problem and, holding the button down; drag it into the correct position in the answer box. release your mouse button when the item is place.
if you change your mind, drag the item to the trashcan. click the trashcan to clear all your answers.
add the following polynomials, and then place the answer in the proper location on the grid. write the answer in descending powers of x. find the sum of (5x3 + 3x2 - 5x + 4) and (8x3 -5x2 + 8x + 9).

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?