Problem 1
Source: Scott Anderson at YouTube: https://www.youtube.com/watch?v=-THTdqEvU8A
Problem 2
Source: mathisasport at YouTube: https://www.youtube.com/watch?v=03DoDtsrxg0
Problem 3
Source: Scott Anderson at YouTube: https://www.youtube.com/watch?v=iC1o_Pgciwc
Problem 4
Source: mathisasport at YouTube: https://www.youtube.com/watch?v=T3zcWuW7Lpo
Problem 1 Form B
Source: Tom Cochran at YouTube: https://www.youtube.com/watch?v=FERKcFGigC8&list=PLdiOLztuJh4yQCNXaHK60sXKdJMWIAyyU&index=5
Problem 1 Form B
Source: Chloe Rogers at YouTube: https://www.youtube.com/watch?v=fV1tJITgj9M
Problem 2 Form B
Source: WOWmath at YouTube: https://www.youtube.com/watch?v=YCcpmLcvcMM&list=PLBF2BE89798DE6FC3&index=40
Problem 3 Form B
Source: Scott Anderson at YouTube: https://www.youtube.com/watch?v=8XITWxfQOkE
Problem 4 Form B
Source: Tom Cochran at YouTube: https://www.youtube.com/watch?v=_6DkHrbl7tw&index=2&list=PLdiOLztuJh4yQCNXaHK60sXKdJMWIAyyU
Problem 5 Form B
Source: mathisasport at YouTube: https://www.youtube.com/watch?v=wS4LgmNzHlQ
Problem 6 Form B
Source: Scott Anderson at YouTube: https://www.youtube.com/watch?v=qRHm-F-33Ao