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How long have number systems been around?
Number systems have been around since before recorded history - since people began to count how many arrows, or children, they had.
Why do the Roman numerals use letters instead of Arabic numbers?
If the Roman had used the same numbers which are used in the Arabic number system then they would have been using the Arabic number system. The whole point is that they used a different system. The other half of the whole point is that the Roman empire fell before the Arabs and Hindus developed their number system. The Romans 'borrowed' their system from the Etruscans; they could not borrow what had not yet been invented.
How long has the Hindu-arabic system been used in Europe?
The numerals were introduced into Europe around the 10th century.
Is there a number 0 in roman numerals?
The Romans did not have the number 0 (zero) in their mathematical system. It wasn't until the 9th century that zero was introduced into any mathematical system. It is thought to have happened first in India. Zero has been called "the last number accepted universally by mathematicians."
Why does the number of insects are more than the number of mammals?
becaus insects have been around long befor mammals even befor the dinos have and beyound that
