John participated in a race that included running, biking, swimming and rowing over a set course that ranged many miles. 3/12 miles of the course was set for running, 12/36 miles was designed for biking, 1/6 miles of the course was for set for swimming and the rest of the course was designed for rowing. How many miles of the course were used for rowing?

I've never been good at math he told he loves but he keeps cheating on me, so it ain't adding up sis

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?

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b