# 20 Most Recent Texas Instruments TI-84 Plus Calculator - Page 5 Questions & Answers

Press WINDOWS function key, or just reset the calculator.

Texas... | Answered on Aug 29, 2014

You may be in a wrong MODE. But even in any computational mode you should be able to do simple operations.

Texas... | Answered on Aug 29, 2014

Use the equivalent definition
cot(x) =1/ tan(x)

Texas... | Answered on Aug 28, 2014

You have a dimension mismatch if (for example) you are doing 2-var stats and the two lists do not have the same length. You can also have mismatch with matrices.

Texas... | Answered on Aug 28, 2014

Press 2nd then TAN

Texas... | Answered on Aug 25, 2014

Go to your stat plot screen, and select option 4 (PlotsOff), Press Enter, and try to plot a normal graph again

Texas... | Answered on Aug 24, 2014

The screen is probably leaking the liquid crystal.

Texas... | Answered on Aug 17, 2014

Look under Math>Probabilities. Symbol is nPr

Texas... | Answered on Jul 25, 2014

You apparently have your calculator set to display no digits to the right of the decimal point. 5/2 is 2.5, which rounds to 3, and 50/100 is 0.5, which rounds to 1.

To change the display setting, press MODE, highlight the desired settings on the first two lines, then press ENTER followed by 2ND QUIT. Try setting "NORMAL" and "FLOAT" and see what results you get now.

Texas... | Answered on Jul 24, 2014

You're probably trying to graph a function that does not involve stat plot features. You can correct this by turning off the stat plot features. Press "2ND" "STAT PLOT" and then select 4:PlotsOff.

Texas... | Answered on Jul 24, 2014

There is no such button. The factorial function is in the probability submenu of the math menu. Press MATH left-arrow 4 to access the factorial.

Texas... | Answered on Jul 23, 2014

Your right you should be in degree mode. However, my guess is you are somehow entering in cot wrong in your calc. Recall cot = 1/tan! In your graphing calculator enter: 35(1/tan(61) = 19.4.
Hope this helped!

Texas... | Answered on Jul 10, 2014

Hi,

This could be a contrast issue. Look for blue contrast markers on the up and down arrow keys on the top-right of the device.

1. Press "Alpha" (top left of device below screen)
2. Press the down arrow key on the right towards the top of the device

Repeat these steps until the screen becomes clear again (you must press "Alpha" for each contrast adjustment).

If down doesn't work, try up several times instead.

Texas... | Answered on Jul 03, 2014

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.

Texas... | Answered on Jun 15, 2014

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