(16/81)^-1/4

need help explaining how to get the answer.  Thanks
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2 Answers

(16/81)^-0.25

=(81/16)^+0.25

=5.0625^0.25

=1.5
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11X11=4 22X22=16 33X33 =  could it be 81 and why or why not and why
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