F(1)=4 f(n)=f(n-1)x(-0.5) f(n)=?

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

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?

Which equation is y = -6x2 + 3x + 2 rewritten in vertex form?