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65000
0.039
The lower bound for 1 significant figure for the number 90000 would be 80000. This is because when rounding to 1 significant figure, we look at the first non-zero digit from the left, which in this case is 9. To determine the lower bound, we keep the 9 in the same place and replace all other digits to the right with zeros.
55000
Well, friend, when we talk about the lower bound of a number, we're looking at the smallest possible value it could be. So, for 19.4 corrected to 1 decimal place, the lower bound would be 19.3. Remember, it's all about paying attention to those little details and finding the beauty in each number!