How was your guys' Thanksgiving??? It's the first day of December, so that means there's only 24 more days til Christmas What do you guys want

Given the following sampling distribution of one mean with a sample size 49, from a normally distributed population,find the population standard deviation, o.79828588912497

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?