What is the greatest common factor of 21 and 49

Aline on the wall and a line on the floor are skew. always, sometimes, or never?

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 one is true about the hexagons ?