- How do you enter a plus minus sign?
- how do i use the inverse log operation on the TI-84
- how do i check the
- where is the equal sign on the ti 84 plus
- My TI-84 Plus won't graph two functions at once.
- how do input subscripts into
- how do you use a plus or minus sign on a TI-84
- TI 84 will not graph multiple functions simultaneously
- how do i put brackets
- How do I put cosecant, secant, and cotangent

Title says it all.

to put X+-X is to use the "(-)" button and not the "--" button for a negative.

Posted on Feb 09, 2009

Hi,

I'm trying to calculate something for chemistry and the function I need to perform is the inverse log operation. To calculate the ph of a substance the formula is -log(value) but to calculate what i need to now I need to use an inverse log function and removing the - sign before the log key is not working. I have also tried the L1 function and it doesn't work either.

Thanks

The problem is simple. You're trying to get an [H+] concentration which is obviously going to have a value of some number times ten raised to a negative power. Therefore, you have to insert the negative value of the pH into the 10^(x). When you insert said negative number you will come out with the right answer.

i.e.

The pH of a sample of human blood was calculated to be 7.41. What is the [H+] concentration of the blood?

10^(-7.41) = [H+]

[H+] = 3.9 E-8

(the answer should only have two sig. figs because the pH has two digits after the decimal.

Posted on May 18, 2009

how do i check the battery life of the calculator?

The life of the batteries depend on the use. If calculator is on and running programs 24 hours a day, the batteries will not last more that 2 or 3 days. If you use it the calculator for 2 hours a day, fresh batteries may last a semester.

But I believe you want to check the CURRENT state of the batteries. You can buy from an electronic store or a dollar store a device that tells you if a battery is still good or not.

With the TI Connect software you can check battery status. See the screen capture that follows. To obtain the displayed window you must click the button DeviceInfo with calculator connected to the computer and TI Connect running.

Posted on Jul 17, 2011

where is the equal sign on the ti 84 plus

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

kindly rate me..
thanks for using fixya..

Posted on Mar 03, 2010

My TI-84 Plus won't graph two functions at once. Only one equal sign highlights. My math teacher doesn't even know what to do and I really need two functions to show on one graph.

Hello,**Turn the satistical plots OFF**

Press [2nd][Y=] (STATPLOT). Select or enter 4: to execute the command [PlotsOff] [ENTER]**Clear the lists (statistical lists)**

Press [2nd][0] (Catalog]. Press [PGRM] C. The cursor jumps to the first command in catalog that starts with C (The greek letters in names do not matter). Scroll down a bit to reach the command [ClrAllLists]. Select it and press [ENTER].**Try your graphs again**.

If you still have problems, just **reset the RAM**:

Press [2nd][+] (MEM). Press 7 to select [Reset] then [1:All Ram][2:Reset]. Press [Clear] to erase the Ram Cleard message.

Now you should be able to draw the graphs.

Hope it helps.

Thanks for using FixYa.

Posted on Nov 19, 2009

how do input subscripts into a program with a TI-84 Plus? Like Y(sub 1)=y

Use the square brackets ("[" and "]"). They're the shifted functions of the multiply and subtract keys. For Y(sub 1) enter it as "Y[1]".

Posted on May 16, 2011

how do you use a plus or minus sign when in y= mode on a TI-84 PLUS silver edition calculator?

Hi,

You cannot use the ± in the definition of a function. If you need to consider two alternatives, you have draw each function separately, one function as Y1 and the other as Y2. I just checked the catalog of commands, and there is no ±.

Hope it helps.

Thanks for using FixYa

Posted on Nov 19, 2009

I have had the TI84 for more than a year. Recently, it stopped graphing completely because somehow the PLOT 1 PLOT 2 PLOT 3 at the top of the function (Y =) screen were highlighted. Now I can get one fuction at a time....anyone know how to make the TI84 graph multiple functions simultaneously?

Already tried highlighting multiple functions (and only one equal sign will highlight at a time) and already reset Mode to SIMUL. Have also tried changing the line type at the far left of the function...no effect.

Turn off transformers. Go to apps and go all the way down until you reach transformers then hit enter. Then a menu should appear and hit uninstall that should fix it.

Posted on Sep 13, 2008

how do i put brackets in a problem

Use the parenthesis above the 8 and 9 keys. Don't use the curly braces on those shifted keys (those are for lists) nor the square brackets on the multiply and subract keys (those are for arrays).

Posted on Sep 16, 2010

How do I put cosecant, secant, and cotangent functions into my ti-84 plus?

By definition

- cosecant of X =1/sin(X), must not be confused with arc sine [sin^-1]
- secant of X =1/cos(X), must not be confused with arc cosine [cos^-1]
- cotangent of X =1/tan(X), must not be confused with arc tangent [tan^-1]

On this calculator, you have two ways to calculate one of these functions. EX cosecant of 37 degrees

- You enter 1 / [sin] 37 [ ) ] [ENTER] result is 1.661640141
- You enter [sin] [ ) ] 37 [ENTER] followed by [X^-1] to take the reciprocal of the previous answer. The [X^-1] key is the one just below [MATH].

Posted on Jan 21, 2010

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