When purchasing an automobile, a down payment is a. full payment made after purchase b. a monthly partial payment c. full payment made at time of purchase d. partial payment made at time of purchase

Can some one me with this math problem?

Write the expression in complete factored form. 5n_(c - 3) - n(c - 3) =

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?