Ajar contains 12 marbles. four are red, 3 are white, and 5 are blue. a marble is randomly selected, its color recorded, and then the marble is returned to the jar. a second marble is randomly selected. find the probability that both marbles selected are blue.

Volume of cylinder with a radius of 8cm and height of 25 cm

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

The probability that a student graduating from suburban state university has student loans to pay off after graduation is .60. if two students are randomly selected from this university, what is the probability that neither of them has student loans to pay off after graduation?