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Earn +20 ptsQ: What was the base 20 numbering system and who invented and used it?
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Hindu-Arabic numerals were developed around 400 B.C. and are used in a decimal (base 10) system. Which of these is true about Arabic numerals?
They were invented in India and brought to Europe by Arabs.
Where was the first key invented?
The original lock and key system was used by Egyptians over 4000 yrs. ago, as discovered by archaeologists. They were crude, and made of wood, but they were the forerunners of the lock and key system we still use today.
When were the gallows invented?
it was invented in eighteen twelve by Cheyenne architect James p Julian.
When was the IV invented?
The first IV saline was used in 1832. Thomas Latta first used it during the cholera epidemic for patients who were sick.
How some Europeans used the head- right system to their advantage?
I believe that they used the headright system to capture, buy, and sell African slaves, but i'm not a 100% sure.
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