Which expressions are polynomials?

select each correct answer.

y^2−y√3+4

2x^4−y

6 + w

z + 1

what is the degree of the polynomial 3xy^2z−2z^5+2/3y2^z^4 ?

2

4

5

6

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?