Issues that you should look for to correct the proofreading stage:
Grammar
Spelling
Punctuation
Answer:
The first one is C and the second one is C I think
Explanation:
So first you would want to round the numbers to the nearest tenth.
243.9 + 132.4= 376.3
Though a bit lengthy (which is absolutely fine!) you seem to go into some good detail while withholding main points for the rest of your paper and it is very well done!
The basic idea of this quote )and the lines that come before it) is that one must live life to the fullest extent possible. Thoreau is giving this as his reason for coming out into the woods. He doesn't want to be in the position where, when he's about to die, he realizes that he never really lived.