At a local fair, a hamburger cost $2.50, and a drink cost $1.50. which expression represents the cost of x number of hamburgers and y number of drinks? a) 4.00xy b) 4.00 + x + y c) 2.50x + 1.50y d) 2.50 + x + 1.50 + y

Which fraction below is equivalent to 10/12?

7. the area of the playing surface at the olympic stadium in beijing isof a hectare. what area will it occupy on a plan drawn to a scaleof 1: 500?

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?