If a sample of 21 runners were taken from a population of 580 runners, μ could refer to the mean of how many runners times?

Look at this expression. a3b3c a-3b-3c-1 which of the following is the simplest form of the expression above?

What is (28 + 7 + 6 + 3) x 1/2 show your work

There are 15 plates and each plate is either 7 or 12 inches diameter. which systems of equations do you use to find the number of 7 inch plates, x and 12 inch plates, y