Mr. Kim's cell phone bill shows that the average length of each of his phone calls was 1/5 hour. The bill also shows that he spent a span of 4 hours on the phone. How many calls did he make?

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?