According to proportional relationships, how much money did the song bring in from sales in the first week if the pop start earned $800 that week?

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?

Ithink i know it but i want to be sure so can you me out ?

Which equation represents a direct linear variationa. y=x2b. y=2/5xc. y=1/xd. y=x+3