To simplify the expression \( 13^7 \times 13^{19} \), you can use the exponent rule which states that when you multiply two exponents with the same base, you add the exponents:
\[ a^m \times a^n = a^{m+n} \]
Applying this to the expression:
\[ 13^7 \times 13^{19} = 13^{7+19} = 13^{26} \]
So, the simplified expression is \( 13^{26} \).
The correct response is:
13 to the 26th power.