Answer:
(-1.8) is greater than (-2.1)
Explanation:
This is because when finding greater or than less with negatives you use what farther or closer to zero(0) For example our situation right here (-1.8) and (-2.1), -1.8 is closer to zero than (-2.1). If you were trying to find is was what was less than, than you would look at whats farther from 0(zero).