20 Most Recent Texas Instruments TI-84 Plus Silver Edition Graphic Calculator - Page 7 Questions & Answers

The coefficient of determination is r squared, so if r is 0.802 then r squared is about 0.643 .

You have several types of graphs Function graphs Y_1=f(x), Y1=3X^2-4, [X, T, Theta, n] key types X Polar graphs r=F(theta), r=r_o*ln(theta). [X, T, Theta, n] types Theta Parametric graphs X_1=f(T) and Y_1=g(T). [X.T, Theta, n] types T Examples: X_1= cos(T). Y_1= 2(1--sin(T)) Sequence graphs u_n+1= f(u_n), [X,T,Theta,n] types n

The square root of 148 is 2*sqrt(37), the square of 3*sqrt(12) is 108, but that's not the point.The TI-84 can't produce results like 2*sqrt(37). It can produce results as fractions but not involving roots. Some other machines, like the TI-89 can, but not the 84.Sorry if that wasn't the answer you were hoping for.

I had the same problem. Here's whutcha do: You know that USB cable that came with your calculator that hooks up to your computer? You're gonna need it. First, take out one battery from your calculator. Then hold down the DEL button. Whilst holding it down, re-insert the battery. Now turn the calculator on. Hooray! It doesn't say Garbage Collecting anymore! Now it says "Waiting... Please install operating system now." Now you hook up your calculator to your computer with that cable. Go into TI CONNECT (if you don't have it, download it at TI's official website), and transfer the newest OS (also available at TI website). Now your calculator is working again. Woohoo.

Hi ezheng1000,

A battery reset procedure should bring your Ti 84 Plus back to life.

Make sure the batteries are in correctly? The batteries alternate negative/positive, positive/ negative and so on. The first time I put the batteries in, I didn't have them in correctly. I know if it happen to me that anybody could make the same mistake. And of course, the calculator will never come on if the batteries aren't in correctly.

The process below should reset your calculator.

Please be prepared to re-install the calculator's OS if you run through this process.

1). Pressing the [2nd] key followed by pressing and releasing the [Up Arrow] key. This adjust the contrast in case the contrast was to low. Keep repeating if necessary for about 10 seconds and, then go to the next step. If calculator comes on and responds to key functions your done.

2). Remove one of the AAA batteries. Press and hold the [CLEAR] key. While holding [CLEAR],
reinsert the AAA battery and then turn the calculator on. The calculator should display the
message "RAM Cleared". Release the [CLEAR] key and then press it one more time to remove the message. If calculator starts responding to key functions your done.

3). Remove one of the AAA batteries. Press and hold the [DEL] key. While holding [DEL], reinsert the AAA battery and then turn the calculator on. The calculator should display
"Waiting...Please install calculator software now". Follow the instructions for the
TI-83 family or TI-84 Plus family to reinstall the calculator operating system.

4). Steps to re-installing the operating system:
~Connect the TI Connectivity cable between the PC and the calculator.
~Click on Start >> Programs >> TI Tools >> TI Connect >> TI OSDownloader
~Follow the on-screen directions to reinstall the calculator's OS.

5). Remove all of the batteries including the round lithium battery for 5 minutes. After the 5 minute period, reinsert all of the batteries and turn the calculator on. Adjust the contrast if necessary.

6). If the above process did not work. Try re-doing the procedure and, extend the time in step 4, by 5 minutes to 10 minutes before you put all the batteries back in the calculator. These calculators can be a little stubborn at times so, keep trying and follow the procedures.

TI calculators have an annoying habit of dimming the screen when the batteries are changed so that it appears as if the calculator isn't turning on. Turn the calculator on (or at least press the ON key). Press and release the 2ND key. Press and hold the Up-arrow key for a few seconds and see whether the screen becomes legible. Does it?

Remove one of the AAA batteries. Press and hold the DEL key. While holding DEL, reinsert the AAA battery and then turn the calculator on. The calculator should display "Waiting...Please install calculator software now". Follow the instructions for the TI-83 family or TI-84 Plus family to reinstall the calculator operating system.

The calculator cannot determine that for you. But if you enter a value outside the domain it will display an error message Let there be a function y=f(x).The domain of the function is the set of values that x is allowed to take. For example, the domain of the f(x)=x^2 is the whole of the real line: any real value you might think of has a square.The range of a function is the set of all values that the function can take. For f(x)=x^2 the range is [0, infinity[

If it is just a matter of not seeing all points, just set the zoom to ZoomStat.

The only thing you can do to the axes (x and y) is to display them or not to display. When the axes are displayed they are solid (uninterrupted, continuous) lines. I am quite puzzled by what is happening here. Are you drawing inequalities? If so and one condition is y<0 or y>0 maybe the x-axis being the boundary line between the two half planes might appear dashed and solid. Do you have a picture?

It depends what you want to do with it. The decimal marker (radix mark) is the dot (.). The comma is used in programing, and to separate arguments in command lines.

Does the cursor show up at all? TI calculators have an annoying habit of dimming the screen when the batteries are changed so that it appears as if the calculator isn't turning on. Turn the calculator on (or at least press the ON key). Press and release the 2ND key. Press and hold the Up-arrow key for a few seconds and see whether the screen becomes legible.

The standalone version of the OS for the TI84Plus/TI84Plus SE are not for TI-Nspire with TI84 keyboard. The 94 Plus part of the TI-Nspire is updated when you update the OS of the TI-Nspire. The version numbers are different.To update you TI84 portion of the TI-Nspire, update the OS for the TI-Nspire. Thy are now at Version 3.2.3.1233

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To get the correlation coefficient, open the CATALOG by pressing [2nd] 0 (CATALOG)Press the [x-1] key for the letter DScroll down from the cursor position to reach DiagnosticsON.Highlight the command and press EXE.Use the statistic utilityPress the STAT key.Press 5 to execute the SetUpEditor commandPress the STAT key again then 1:EditEnter an x-values in list L1, and the corresponding y-values in list L2. This way if your data set is not sorted in x, you can use the SortA( command.After you enter the x- and y-values, exit the EditorPress the STAT key then scroll once to CALCSelect 2:2-var Stats.The command will echo on the main screen. Press EXE to execute it.If there are no errors you statistics will be diplayed. Among them you will see R^2.

:Prompt A
:Prompt B
:Prompt Cdf
:Disp(-B+sqrt(B^2-4AC))/2A
:Disp(-B-sqrt(B^2-4AC))/2A

Something is shorted internally. You might be able to take it apart and clean it out, reassemble and try again.

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