How do you use a calculator to evaluate the expression log 0.8 to four decimal places?

To evaluate the expression log(0.8) to four decimal places using a calculator, follow these steps:

Turn on the calculator: Ensure the calculator is in the correct mode for logarithms. Most scientific calculators are set to calculate common logarithms (base 10) by default.

Input the number (0.8): On your calculator, enter 0.8, which is the number whose logarithm you want to find.

Press the log button: After entering the number, press the "log" button on your calculator. This will compute the logarithm of 0.8 in base 10.

Read the result: The calculator will display the result. For log(0.8), the approximate value is -0.09691 (rounded to five decimal places).

Round the result: To round this value to four decimal places, look at the fifth decimal place. If it's 5 or higher, round the fourth decimal place up. In this case, the fifth decimal place is 1, so we round down. The result is -0.0969.

So, log(0.8) to four decimal places is -0.0969.