21 quarters out of 186 quarters simplest form

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

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?