Slides day2 day3 day4 day5 day6 day7_n_8 cw9 cw10 cw12 cw14 cw15 cw16 cw17 cw18 cw19 cw20 cw21 cw22, cw22 cw23,cw23 classwk25, classwk25_excel classwk26, classwk26_excel classwk27, classwk27_excel