If she goes with the 25% off she will have to pay 28.80
if she uses the $15 off she will have to pay $35.33 plus the $15 off would be 20.33 so she's better off going through doing it this way rather than the 25% off
Actually the answers A since t is for text messages and it costs .15 and m is minutes and costs .07 so we add those two together to he .15t+ .07m then there's a discount of 2.50 so we subtract. So our final equation is .15t + .07m - 2.50 = C
