Pauline spent $7.50 every day for 3 days. which expression is the best choice to her determine the total amount of money she spent? a. (7.50) × (−3) = −22.50; she spent $22.50. b.(−7.50) × (3) = −22.50; she spent $22.50. c. (−7.50) × (−3) = 22.50; she spent $22.50. d. (7.50) × (3) = 22.50; she spent $22.50.