What is the measurement 1042 l rounded off to two signicant digits ?

This is a really hard question. Because if you change it to 1,000 then that's only one. If you add the decimal so it's 1,000. , then that's 4 if you change it to 1,040, that's 3. So you can not change that to 2 significant digits.

Gas is a type of carbon, i think lol