$\ln10+3\ln x+\ln y$
Work Step by Step
We know that $x\log_ab=\log_ab^x$ and that $\log_ab+\log_ac=\log_a(bc)$ Hence here $\ln (10x^3y)=\ln10+\ln x^3+\ln y=\ln10+3\ln x+\ln y$
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