Question

Write without negative exponets 1/4^-2

Answer 1

The rule about negative exponents is that you put the base under "1" in a fraction and the negative exponent becomes positive.  For example, $x^{-1}$ becomes $\frac{1}{x}$.  So in your case, $\frac{1}{4} ^{-2} = \frac{1}{ \frac{1}{4} ^{2} } = \frac{1}{ \frac{1}{16} } =16$