If a and b are two rational numbers, which expressions are equivalent to a-b? Mark all that apply.

A. a-|-b|, if b>0.

B. a+|-b|, if b>0.

C. a + (-b), if b>0.

D. a-|-b|, if b<0.

E. a+|-b|, if b<0.

F. a + (-b), if b<0

What is the negative exponent of 1 / 49

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