Quadratics Review - Part Two (#20-28)

ahall.kingsport...
The above is a link to the problems worked out in this video.
This is a review for a test over Quadratics that I made for the students in my Algebra 2 class.
Questions and when I get to them in the video:
#20 - 00:25
#20b - 02:43
#21a - 03:42
#21b - 05:55
#22 - 09:32
#23 - 12:33
#24 - 15:09
#25 - 19:12
#26a - 23:50
#26b - 25:11
#27 - 25:48
#28 - 26:27