Final answer:
The common logarithm of 0.55 is calculated using a calculator's LOG button, and the result is -0.2596 when rounded to four decimal places, corresponding to Option 2.
Step-by-step explanation:
The subject involves calculating the common logarithm of the number 0.55 using a calculator and then rounding the result to four decimal places. When finding the logarithm of any number less than 1, the result is always negative. To calculate the logarithm, you would use the LOG button on your calculator. After entering 0.55 and pressing the LOG button, you round the result to four decimal places.
After performing the calculation, the result is that the common logarithm of 0.55 rounded to four decimal places is -0.2596. Hence, the correct option from the ones provided is Option 2: -0.2596.