The image is not really clear
5x-2+x=9+3x+10
6x-2=3x+19
3x=21
x=21/3
x=7
Complement of JEF is 50 degrees
supplement of JEF is 140 degrees
complement of DON is -34 degrees or depending on your teacher, the answer is NONE.
supplement of DON is 56 degrees
The angle of rotation for a regular polygon is 360/number of sides.Here, it is 360/20=18 degrees.
3.5 or 4 if you can only get 4 pound bags. Hope this helps!