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Which of the following is not correct? 

    • 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 = 39

  • 4/5 x 4/5 x 4/5 x 4/5 x 4/5 x 4/5 x 4/5 x 4/5 = (4/5)8

    • (-0.9)4 = (-0.9) x (0.9) x (0.9) x (0.9)
    • 43 = 4 x 4 x 4