Jay went on a diet and lost 5 pounds each month. Find Jay's net weight change in 6 months.

If you could answer these your a life saver

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%

How can (square root of 25) ^2 be rewritten?