X^2-14x-4=0, solve by completing the square

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%

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

How do the number line graphs of the solutions sets of -23 > x and x-23 differ?