Here is some free point I hope everybody passes their classes:)

Why do you need to classify the size of a particle

Guys plz and say a best answer i will give 15 points how we should prepare for a scholarship exam

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?