For a rational number represented by the letter a, is it positive or negative

All possible.

If a is a positive number, then -a is what number? If a is a negative number, then -a is what number? In addition to positive and negative numbers, what rational numbers can the letter a represent?

(1) A is a positive number,
A >0,
-A <0,
That is,-a is negative.
(2) A is negative,
A <0,
-A >0,-a is a positive number.
(3) According to the classification of rational numbers, the letter a can represent the rational number 0 in addition to the positive and negative numbers.

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