To express \( 2^{-4} \) in terms of a base raised to a positive exponent, you can use the property of exponents that states \( a^{-n} = \frac{1}{a^n} \).
Applying this property:
\[ 2^{-4} = \frac{1}{2^{4}} \]
So, \( 2^{-4} \) can be expressed as:
\[ \frac{1}{2^{4}} \]
This is the expression using positive exponents.