Alocal club organizes a festival with an entry fee of $6. at the festival, bags of popcorn cost $4 each. which expression can be used to calculate the total amount of money spent by a student who attends the festival and buys x bags of popcorn?
group of answer choices

a. 4x

b. 4x + 6

c. 6x + 4

d. 6x + 4x

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?