A hiker begins on top of a mountain that stands 12,500 feet above sea level. He walks down to the valley that is 250 feet below
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Subtract the terms from each other, then the
terms, then the ones without any
whatsoever.
First, we'll subtract from
Result:
Next, we'll subtract from
Result:
Finally, we'll subtract from
Result:
Now, we can add these 3 results together.
First, we had , then
, and finally
.
Thus, our subtraction of
equals