Please help with the following programming questions

1.) The grammar goes:

=

+

| *

| ()

|

A | B | C

a.) Show left-most derivation of A = B + C * (B + C)

b.) Does this grammar handle operator precedence, use example expressions to support your answer.

c.) Change the grammar so that subtraction and division are accepted as valid operators in the expression

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2.) One attribute of a variable is address. Explain how a variable may bound to different addresses during program execution, use example(s).