Jaxon goes to a store an buys an item that costs xx dollars. He has a coupon for 20% off, and then a 4% tax is added to the discounted price. Write an expression in terms of xx that represents the total amount that Jaxon paid at the register.

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?