The average mass of an automobile in the united states is about 1.440x10^6 g express this mass in kilograms

From the problem statement, this is a conversion problem. We are asked to convert from units of grams to units of kilograms. To do this, we need a conversion factor which would relate the different units involved. We either multiply or divide this certain value to the original measurement depending on what is asked. From literature, we will find that 1000 grams is equal to 1 kilogram. We use this as follows:

 1.440x10^6 g ( 1 kg / 1000 g ) = 1440 kg