Find the value of the variables I’ll mark the brainiest!

Which best explains why this triangle is or is not a right triangle?

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

Which number produces a rationale number when multiplied by 1/5