What is the maximum radius of each ball

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

Ineed me i stuck and i don’t want to get it wrong

Arectangle has a width of 5 cm and a length of 10 cm. if the width is increased by 3, how does the perimeter change?