5 + x + 3 + 2x = -2(4x - 15) show the work

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%

Including 6% sales tax, an inn charges $135.68 per night. find the inns nightly cost

How can you find the mean absolute deviation (mad) for this set of data?