Write a differential equation that is a mathematical model of the situation described. The time rate of change in the temperature t of coffee is proportional to the difference between the fixed temperature m of the air at time t and the temperature of the coffee at time t

Case # 51173878 weighs 814 pounds; case # 51173981 weighs 803 pounds; case # 51174058 weighs 817 pounds; case 51174178 weighs 815 pounds; case # 51174248 weighs 817 pounds; case # 51174495 weighs 781 pounds; case # 51174577 weighs 828 pounds. what are the case #'s of the two cases that weigh the same amount?