When does it make sense to compare the absolute values of numbers rather than the numbers themselves?

The table respent two linear functions the equation respented by the first tables is given

[15 points, algebra 2]simplify the complex fraction and find the restrictions.

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%