Which sampling method divides the population up into sections, randomly selects some of those sections, then chooses all the members from the selected sections to study?

Which expression is equivalent to (9x - 3 1/ + 1 3/8)

Write an inequality and solve each problem.for exercises 11 and 12, interpret the solution.

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.