Select all the equations that describe the situation.
Han's house is 450 meters from school. Lin's house is 135 meters closer to school.

Select all that apply:
1)Z=450+135
2)Z=450-135
3)Z-135=450
4)Z+135=450

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

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I’m stuck on this equation, anyone got the answer?