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Answers
Answer:
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Step-by-step explanation:
Fire provided a source of warmth and lighting, protection from predators (especially at night), a way to create more advanced hunting tools, and a method for cooking food. ... These cultural advances allowed human geographic dispersal, cultural innovations, and changes to diet and behavior.
Answer:
Answer:
Step-by-step explanation:
Let us think of a number say 3.
On doubling 3 we get 6.
Adding 9 with the result we get 15.
On subtracting 3 we get 15-3 = 12
Dividing 12, we get 6.
Subtracting 3 from 6 we get 3.
Why do we get the same number?
This is a part of mathematical modelling. The way we frame a question, in some tricks, we just formulate the same, to get the reverse number back. This can be done by subtraction, addition or any arithmetic operation, by doubling, tripling etc ..
We can relate it to a tree formed in XML as well, that's mathematical modelling.