A21-inch board is to be cut into three pieces so that the second piece is twice as long as the first piece and the third piece is 44 times as long as the first piece. if x represents the length of the first piece, find the lengths of all three pieces

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%

The quotient of 15 and a number is 1 over 3 written as an equation

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $36.98. find the probability that a randomly selected bill will have an amount greater than $173, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?