I’m a class of 25 students 15 of them have a cat 16 of them have a dog and 3 of them have neither. Find the probability that a student chosen at random has a cat and a dog

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?