Please help, choices are given

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

How do i put 3(x+7) in distributive property

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?