Comments by Cheng Donald Most recent public comments by Cheng Donald https://nowcomment.com/users/63988 Will it be difficult for student to accept that intersection point is a solution? i.e. will it be a new concept to them? https://nowcomment.com/documents/161358?scroll_to=1535759 https://nowcomment.com/documents/161358?scroll_to=1535759 Tue, 03 Dec 2019 01:56:29 -0500