A woman invested 3 times as much at 7% as she did at 3%. The total amount of interest she earns in 1 year from both accounts is $720. How much did she invest at each rate

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%