The science club hosts a bake sale every year to raise money for
the state robotics competition.
This year, the club earned $20
more than twice what it earned
last year.
Let x represent the amount
raised last year
"More" means adding, and "twice" means multiplying by 2.
What is the algebraic expression? Explain how you came to this conclusion

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?