To rewrite the expression \( \frac{4^7}{4} \) using a single positive exponent, you can use the property of exponents that states \( \frac{a^m}{a^n} = a^{m-n} \).
Applying this property:
\[ \frac{4^7}{4} = \frac{4^7}{4^1} = 4^{7-1} = 4^6 \]
So, the expression using a single positive exponent is \( 4^6 \).