Hey there!
Let's start out with one question.
What does the word (descended) even me?
In this question above, it asks this question alot.
The word (descended) means to "move or fall downward".
Now that we got this information, we can now answer this question.
So, This man went into the mine at 1,200 (ft) (downward).
Then, he rose up the mine 900 (ft) (up).
So, we do 1,200 - 900, and this would give us (300)
So now he is only 300 (ft) in the mine.
And then, after this, he descended 350 (ft) back down.
So, we do 300+350, and this would give us (650).
Your correct answer would be. . .
[tex]\boxed{\boxed{650}}[/tex]
Hope this helps.
~Jurgen
