Texas Instruments came up with the first calculators in the 1970's - so, Texas.
There are many calculators that come with covers. Compucessory, Office Depot, and Texas Instruments all have great calculators with protective hard covers.
Texas Instruments makes the best reviewed scientific calculators.
Electronic calculators can be used in conjunction with additional tools. Texas Instruments makes a variety of these tools, and they can be purchased at the Texas Instrument website.
Texas instruments is the best brand of math calculators. This is based on the ease of use, affordable price and a large number of functions that these calculators have.
if you have a Texas instruments calculator, you can check out www.texasinstruments.com
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Texas Instruments make graphing calculators, for advanced mathematics. They currently produce around 10 different models with various differences and abilities.
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Annuity calculators are used to calculate the returns on investments made in annuities.
The Texas Instument TI-84 model or higher
Scientific calculators can calculate numbers into scientific notation, great for earth science and chemistry class. These are made by Texas Instruments.