by what number should we multiply 4 raised to the power -3 to get 64?

The number which is multiplied by (-8) raised to the power -1 to obtain a product equal to 10 raised to power -1 is ____________.

Hope the question is understandable!

ques1. Let the no = x
           x*4^-3=64
           x*(-64)=64
           x=64/-64
           x=-1
  
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