Compute {{MATH_13}} using logarithms. {{CMD_14}} Start by writing both numbers in scientific notation {{MATH_15}} Next we use a log-table, which gives {{MATH_16}} for values of {{MATH_17}} ranging between {{MATH_18}} and {{MATH_19}}. We've reproduced part of such a table below. {{CMD_20}} {{ENV_21}} {{CMD_22}} From the table, we see that {{MATH_23}} Add these numbers together to get {{MATH_24}}. Essentially, we know the following at this point: {{CMD_25}} {{ENV_26}} {{CMD_27}} Using the table again, we see that {{MATH_28}}. Since we were working in scientific notation, we need to multiply this by {{MATH_29}}. Our final answer is {{MATH_30}} Since {{MATH_31}}, this is a good approximation. {{CMD_32}} {{CMD_33}} The moral is: {{CMD_34}} {{CMD_35}}Logarithms allow us to use addition in place of multiplication.{{CMD_36}} {{CMD_37}}