Acontractor combined x tons of a gravel mixture that contained 10 percent gravel g, by weight, with y tons of a mixture that contained 2 percent gravel g, by weight, to produce z tons of a mixture that was 5 percent gravel g, by weight. what is the value of x ?

Which expression converts 45 degree to radians

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?

Bob the builder is making 480kg of cement mix. this is made by cement, sand and gravel in the ratio 1: 3: 4