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Simplify (2t^–3)^3(0.4r)^2

A.)3.2r2
B.)1.28r^2/t^-6
C.)1.28R^2/t^9
D.)0.8r^2/t^-6

I think it is A.
Thank You.

  • Math -

    (2t^-3)^3 = (2/t^3)^3 = 8/t^9
    (.4r)^2 = .16r^2

    multiply them to get 1.28r^2/t^9

    (C)

  • Math -

    Thank You.

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