no they don't, they give most of the answers but not all the correct ones
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Most calculators will give the answer - if you are smart enough to use one: 1.584
Press 8.6 in sequence. then a key marked 10x (or EXP on some calculators) and then 4.
The square root function is apparent on almost all calculators that are commercially available. Such calculators can be bought at stores like Best Buy, Staples, and Office Depot.
Texas Instruments came up with the first calculators in the 1970's - so, Texas.
Blaise Pascal lived long before the invention of calculators.