Last year, shen opened an investment account with $6600 . at the end of the year, the amount in the account had increased by 7.5% . how much is this increase in dollars? how much money was in his account at the end of last year?

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?