To prove that \(10 \log 100 = 100\), the first step would be to determine what \( \log 100 \) is equal to.
This is done by rewriting \( \log 100 \) in terms of exponential form. Since \( \log_{10} 100 = 2 \) (because \( 10^2 = 100 \)), we can then substitute this into the equation.
Thus, the correct response is: Determine what \( \log 100 \) is equal to.