A bag contains 150 marbles (total). Some are blue, and the rest are white. There are 21 blue marbles for every 4 white marbles. How many blue marbles are in the bag?

Use the normal approximation to the binomial distribution to answer this question. fifteen percent of all students at a large university are absent on mondays. if a random sample of 12 names is called on a monday, what is the probability that four students are absent?

Click on the graphic until you find the right quotient. (36xa - 30xb) ÷ (-6x2)

Find the area of the triangle shown 3 by 6