Which of the following phrases could represent the expression k - 4? four less a number
a number less than four
a number decreased by four
a number subtracted from four

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?

How is this equation completed? i cannot find any examples in the book.

Robert is placing sod in two square shaped areas of his backyard. one side of the first area is 7.5 feet. one side of the other area is 5.7 feet. the sod costs y dollars per square foot