Sarah worked for 1,200 minutes this week, what is the number of hours she worked

Astandard american eskimo dog has a mean weight of 30 pounds with a standard deviation of 2 pounds. assuming the weights of standard eskimo dogs are normally distributed, what range of weights would 99.7% of the dogs have? approximately 26–34 pounds approximately 24–36 pounds approximately 28–32 pounds approximately 29–31 pounds

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Which geometric principle is used to justify the construction below?