How to graph y=-x+4 if y=3x

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

Anyone know? will mark brainliest if correct

Which graph corresponds to the function f(x) = x2 + 4x – 1?