Simplify (2t^–3)^3(0.4r)^2

Question

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.

Answer 1

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

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

(C)

Answer 2

Thank You.