My TI-84 enter button doesn't work - HP 19BII Calculator

If the ENTER button is defective you cannot use the calculator. Have it repaired.

try taking out the triple A batteries and leaving the calculator to sit with them out for a minute or so, replace them and check if it's fixed. If that doesn't work you can do the same, but take out the small button back up battery as well. If you're still not having luck you should call ti cares (800-842-2737) they're usually helpful.

First, check if the calculator is in degrees. Do this by pressing mode and selecting degrees (it should be about the third option down)

The TI-84 doesn't have a dedicated button for secant so you will just have to enter it as 1/cos(-1.2) or cos(-1.2)^-1

What do you mean formatt is the option???

You're in Scientific or Engineering notation.

Press the MODE button to enter the mode editor. Highlight "NORMAL" on the first line and press ENTER. Highlight "FLOAT" on the second line and press ENTER. Press 2ND QUIT to exit the mode editor.

hello sir, Press "second" "math", and it should be the first thing listed. If you need other commands hit "second" "0" that will enter the catalog and you can press any letter (without hitting alpha) to jump to that letter in the list. Please click on the following link to see the manual of the TI-84 Plus Calculator: http://education.ti.com/guidebooks/graphing/84p/TI84PlusGuidebook_Part2_EN.pdf
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I'm not specifically familiar with the TI83 or TI84 but I've used a lot of TI calculators in my time, so I'll give it a try. If your trying to find the antilog of a number in base 10 enter the number and hit the (10 to the X) button. If you're trying to find the antilog of a number in in base e (natural log), enter the number and hit the (e to the X) button.

Enter the fraction for example: enter 8/12.
The answer will be .666666
Then click Math (which is located under the Alpha button).
Click the ->Frac button (the first one).
It should come up as Ans->Frac.
Click Enter.
It should now read 2/3 which is 8/12 reduced.
Note: I have a TI-84 Plus Silver Edition, and the TI-84 Plus might not have this function, but that is how I do it on my TI-84 Plus Silver Edition

Please help me to find the answer for my problem with TI-84:
If I'd like to work with: nDeriv(3X^3+2x^.5),X,1)
then I press Enter button, the sreen shows Error...

Please help me to get the answer for this problem. Thank you very much!

graphing calulators work much like computers. The have RAM space so they can remember what you have done recently and stuff like that. So when it's garbage collecting it means it's trying to find more space. This generally means that you don't have much much ARC or RAM space left. You can see this under your memerory manager. (2nd + enter) then you can reset your calculaor(2nd plus 7 1 2) or you can go to memory manager and unarchive your programs. Fur an example you have TI 84. Most new TI 84 have sientific tools. so if you don't you it take away the archive (*) by pressing enter and then hit DEL. the more RAM space and ARC space should make it so it doens't garababe collect. Hope this works. i can help you more if this doesn't work. GOOD LUCK