I have no clue how I should approach this question.I am aware that + is left associative operator and = is right associative yet I am not sure on how I should answer these questions.Kindly explain me this problem in steps so I can approach other similar problems.

There is a statement written by programmer A A+C+D+B+E and A>-C and CD B E 3.1 (5) Right or left associative grammar should be used for this statement? 3.2 (5) Write the grammar to process this statement. 3.3 (5) By using this grammar show a leftmost derivation and a parse tree for the statement