Three pumps can remove a total of 1700 gallons of water per minute from a flooded mineshaft. if engineers want to remove at least 5100 gallons per minute, how many pumps will they need operating?​

In the diagram of circle o, what is the measure of zabc?

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a

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?