What does a a isolate variable mean?

Which is equivalent to 10/12? options: 10/18 5/6 3/12 9/11

Which of the following graphs represents the function f(x) = 2^x

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