Computers have become much more advanced. Most complicated calculations can be done in seconds, rather than hours or days.
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Something that is changed
Exponents did not change math, per se, math has always been the same. But the use of them has changed the way math is done. It has allowed mathematic formulas to be shortened and simplified.
the letter is called a variable because it can be changed
Pi has undoubtedly contributed to math. Pi can be used for calculating circles and was used to measure distances without doing it the harder way....
There were 10 leap years between 1970 and 2011.