If (a)^2 ends in 9, then (a)^3 ends in:

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A 9
B 7
C 7 or 3
D 3

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Answer: C. 7 or 3

If a² ends in 9, then a ends in 3 or 7. If a ends in 3, a³ ends in 7 (27). If a ends in 7, a³ ends in 3 (343). So a³ ends in 7 or 3.

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If (a)^2 ends in 9, then (a)^3 ends in:

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