36:55

December17 Lesson 10 1 Part B

35:35

December18 Lesson 10 2 Part A Block 4

1:01:39

December11 Lesson 2 2 Final Details and Lesson 9 1 Part A

25:50

December18 Lesson 3 3 Part A

12:47

Formula Cuadrática Versus Formula Citardauq

33:44

December20 Lesson 10 2 Part B and Lesson 10 3 Part A

15:27

December16 Lesson 9 2 Part C and Lesson 10 1 Part A

57:24

December10 Lesson 2 1 Part B and Lesson 2 2 Almost All