Which of the following presents the correct order of buttons to press on a scientific calculator to enter 3.1 x 106?
A. [3] [] [1] [6] [EE]
B. [EE] [6] [3] [] [1]
O C. [3] [.] [1] [EE] [6]
O D. [EE] [6] [3] [] [1]

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?