GCE 2017 Mathematics P2-ECZ, Solved

time stamps 00:00 Intro 00:54 question 1a 04:15 question 1b 08:59 question 2a 11:00 question 2b 20:24 question 3a 25:57 question 3b 30:00 question 4a 33:00 question 4b 37:44 question 5 51:19 question 6a 01:01:54 question 6b 01:05:04 question 7 01:26:19 question 8a 01:36:40 question 8b 01:46:18 question 9a 01:59:00 question 9b 02:02:36 question 10a 02:09:02 question 10b 02:11:53 question 10c 02:13:43 question 11 02:24:44 question 12a 02:31:06 question 12b