Final answer:
To determine whether it is farther to Rome or to Sydney using scientific notation, compare their distances in scientific notation format and compare exponents.
Step-by-step explanation:
To determine whether it is farther to Rome or to Sydney using scientific notation, we need to compare their distances in scientific notation format. For example, if the distance to Rome is given as 4.2 x 106 km and the distance to Sydney is given as 5.6 x 106 km, we can see that the distance to Sydney is farther because the exponent is larger.
In scientific notation, a larger exponent indicates a larger distance. Therefore, by comparing the exponents of the scientific notation representations, we can determine which distance is farther.