Which expression is equivalent to (xy)z?

Graph the equation. select integers for x

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%

Express -5 2/5 as an improper fraction.