matrices exercise 21 full solutions

6:31

11:23

18:04

6:20

17:40

15:03

10:17

4:29

32:12

18:40

8:48

10:51

20:39

1:02:22

48:01

2:23:56

59:13

10:48

1:25:01

2:00:37

54:43

4:10

5:21

7:09

37:18

10:06

55:33

30:55

31:03

38:06

5:35

20:53

13:41

19:17

1:55:31

1:01:41

2:34:54

25:12

16:33

48:05

2:27:35

3:25

16:25

34:59

4:18:38

1:29:31

14:15

30:20

6:38

46:43

2:48

2:00:16

11:32

2:20

6:26

58:59

17:52

10:01

7:16

12:03