Texas Instruments TI-85 Calculator - Answered Questions & Fixed issues

Have you input a formula?

Hello,
Make sure you have fresh batteries. Increase contrast

First possibility.
Press [2nd] and hold pressure
Press UpArrow and repeat this step

2nd Possibility
Press [2nd] key then release
Press UpArrow then release
Repeat the two steps in sequence till contrast is to you liking.

Hope it helps.

If it does not have it, use the equivalent formals Log_base b(a)= ln(a)/ln(b) or log_10(a)/Log_10(b).

I would try replacing the old reserve battery as well. Good luck, Paul

In the CATALOG there is a >Frac command that can be used with parentheses to multiply fractions.
(1/2)(1/3)>Frac
1/6

Press and release 2nd, then press and release down-arrow. Repeat as necessary. If you go too far, press and release 2nd, then press and release up-arrow.

Who says that -29.48 is the best value?

In response to your questions. Have you thought about contacting Texas Instruments Directly? Put in new (fresh batteries), and increase the contrast to the darkest, then reduce it. Do this a few times: It may bring the pixels back to life. If that does not work, consider setting aside this calculator and buying a new one. It suffers from old age, and it is not worth it to try to repair it. Try to get a used one: If you risk nothing you get nothing. Besides that 200 $ figure is erroneous. You can get some good Casios (with a Computer Algebra System) for about 150$. Or a TI84 Plus Silver Edition C (in color) for the same price. OR a N'spire CAS, or an HP 50 G. Need I list others?

Take it in for new screen,to be fitted,or by a new TV.

It may be time to get another calculator.

45 and 112 are relatively prime so no, it can't be simplified further.

For the TI-83 Plus Family, TI-84 Plus Family:Caution: The resets described in these troubleshooting steps will cause a loss of applications, programs and data. If at all possible please create a backup using TI Connect first. 1. Try a new set of AAA batteries. 2. Adjust the contrast by pressing and releasing the 2nd key followed by pressing and releasing the up arrow; repeat as necessary. To adjust or lighten the display, use the down arrow. 3. 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. 4. 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. 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.

Press the 2nd key and the down arrow to lighten the screen.

Do you mean the "geometric mean"? If so, multiply all the numbers together then take the n-th root, where n is the number of data points.

The chi-square test is used for a lot more than just contingency tables.I found one program for the TI-86 (which is basically the same machine as the TI-85, only with more memory) which claims to do the chi-square goodness of fit test.You might also want to browse through this archive.

Do it almost exactly as you wrote it. Press5 + 1 3 / 1 6 =

If you wont to find solution for this equation type solve(log(1296,x)=4,x)See captured image

Many things are named after Leonhard Euler and that includes the base of natural logarithms (e=2.7.....)To use the constant itself you must use e^(1) or enter exponential of 1. A few calculators have a specific key to enter the constant e as for Pi, but most do not and that is why you must use e(1).

Syntax 07 error may occur from the next reasons:1. If the command contains a syntax error. Look for misplaced functions, arguments, parentheses, or commas.2. Exponents can not be more than three digits.3. Sign = is not valid in parentheses excepr where an expressions is required.4. Axes in DifEq must be Q, t, or Q'

The easiest way to resolving this problem is to type x^(1/3)See captured image