Abe earns $30.00 for raking his neighbor's leaves. He bought lunch and has $22.75 left. The equation 3x + 22.75 = 30.00 can be used to determine x the amount of money, in dollars, Abe spent for lunch.
Which value of a represents the amount of money, in dollars, Abe spent on lunch?
O A 2 = 7.25
OB. = 7.75
OC. 3 = 8.25
O D. = 8.75

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?