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Chinese invention of the first manual calculator?
The Chinese invention that was the first calculator was called an abacus. It was invented sometime between 2700 and 2300 BC.
What number is r on a calculator?
There is no such number on a calculator. If you see "R" on a calculator, it is probably some calculation - for example, conversion from polar to rectangular coordinates. Check the manual for your calculator.
Where was the calculator first launched?
The first calculator was never launched, because it was in fact a mechanical calculator.
What was the very first calculator used?
The very first calculator ever used could be an abicus, an electronic calculator, or even your brain. The first calculator invented was the abacus.
Will the graphing calculator do the same as a scientific calculator?
Usually a graphing calculator should have all the capabilities you expect from a scientific calculator (and more, since it does the graphing). For more details, check the manual of your calculator if you already have one.
