What fractional parts is this ruler divided into

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 of the following is true for the relation f(x)=2x^2+1

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?