Place a check mark in the box next to each situation tha represented by the equation (5x-15) = -75. a. mark paid $15 for each of 5 shirt by by credit card, so his available credit decreased by $75 in all. b. peggy donated $15 to charity each week for 5 weeks. her account changed by -$75. c. ryan earned $15 each week for 5 weeks. so he gained $50 in all. d. an airplane descended at a rate of 15 meters per second for 5 seconds. its altitude changed by -75 meters. e. a submarine dove 15 feet and then rose 5 feet. its elevation changed by -75 feet.