What is the simplified form of the equation 4/5n - 1/5 = 2/5n ? answers a. n = -2 b. n = 4 c. n = 1/2 d. n = 2/3

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?

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.

Using only odd number for numerators write two different subtraction problems that have a difference of 3/4