A scientific calculator typically has around 45 to 50 buttons, including numerical keys, mathematical function keys (such as addition, subtraction, multiplication, division), memory keys, trigonometric function keys, logarithmic function keys, and more. The exact number of buttons may vary slightly depending on the specific model and brand of the calculator.
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A Texas Instruments graphing calculator can be used as a basic calculator, a scientific calculator and a graphing calculator.
No.
That topic is covered, exhaustively, in detail, with examples, in the instruction booklet that comes with each of the many different models of 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.
A graphing calculator is a scientific calculator with a graphing display window. Otherwise, there are no limits to the type of calculations that can be made on either of them.