Is there any type of protection from gamma radiation?

Solve this problem e=0+4m+p/6 (i also need to know what they are asking)

Did the universe cool off or get hotter as it expanded after the 'big bang"?

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?