Which fraction is equivalent to 4/-9? Worth 20 points

A. -4/9
B. 4/9
C. -4/-9
D. 9/4

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Can some one me with these questions

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

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