Pauline spent $7.50 every day for 3 days. Which expression is the best choice to help her determine the total amount of money she spent? (7.50)(−3) = −22.50; she spent $22.50 (−7.50)(3) = −22.50; she spent $22.50 (−7.50)(−3) = 22.50; she spent $22.50 (7.50)(3) = 22.50; she spent $22.50