Step 1: Identify the given value and the expression to evaluate. Given: $\log 6.5 = 0.8129$ Evaluate: $2 \log 6.5 + \log 650$ Step 2: Substitute the given value of $\log 6.5$ into the expression. $$2 \log 6.5 + \log 650 = 2(0.8129) + \log 650$$ Step 3: Simplify $\log 650$ using the properties of logarithms. We can write $650$ as $6.5 \times 100$. Using the logarithm property $\log(AB) = \log A + \log B$: $$\log 650 = \log (6.5 \times 100)$$ $$\log 650 = \log 6.5 + \log 100$$ Since the base of the logarithm is not specified, we assume it is base 10. Therefore, $\log 100 = 2$ (because $10^2 = 100$). Substitute the value of $\log 6.5$: $$\log 650 = 0.8129 + 2$$ $$\log 650 = 2.8129$$ Step 4: Substitute the value of $\log 650$ back into the expression and calculate. $$2(0.8129) + 2.8129$$ $$1.6258 + 2.8129$$ $$4.4387$$ The final answer is $\boxed{\text{4.4387}}$.