235-(-12)=247; his elevation changed by 247 m.
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One quarter (25%) of the data is in any quartile. That is the meaning of the term "quartile."
25% of data is in quartile 1
The perfect square
can be expanded as follows:

So, we have to think of the term
as
, which implies
.
Thus, we have to add
, i.e. 16, to complete the perfect square:

Answer:
B
Step-by-step explanation:
3x4 is 12 and 12x6 is 72