To which subset of the real number system does the number "-0.75" belong

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

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')

Could someone with number 1 and 2