A bag contains 6 red marbles and 2 white marbles. A marble is selected, kept out of the bag, and then another marble is selected. What is the probability of choosing a red marble and then another red marble without replacement？

Technicians have installed a center pivot, circular irrigator for a farm that covers 25 acres. a.) how long is the irrigation boom (in feet) from the center pivot to its farthest extent? b.) if the irrigation boom makes 4 full revolutions in a day, how many miles does the end of the boom travel in 5 days?