The value of $10^{\log_{10}7}$ is: 
$\textbf{(A)}\ 7\qquad\textbf{(B)}\ 1\qquad\textbf{(C)}\ 10\qquad\textbf{(D)}\ \log_{10}7\qquad\textbf{(E)}\ \log_{7}10$
$\log_{10}7=x \Rightarrow 10^x=7$
Substitute $\log_{10}7=x$ in $10^{\log_{10}7} \Rightarrow 10^x=?$
It was already stated that $10^x=7$, so our answer is $\textbf{(A)}\ 7$