144 students enter a spelling bee, but only 1/6 of the group will make into the semi-final round, and only 2/3 that group will make into the final round. How many students will enter the final round of the spelling bee?

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?