Texas Instruments TI-84 Plus Calculator - Page 4 - Answered Questions & Fixed issues

Question not clear. Use the definition of sec(x)=1/cos(x).

Do you mean that you get a rectangle? Check your equations.

Press [2nd][F1]

Press WINDOWS function key, or just reset the calculator.

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

Cost of buttons 0.70*1100 $ Revenue =4*1100 $ Profit = revenue -cost. Your turn.

You must be doing it without paying attention.

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

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.

To save energy.

Press 2nd then TAN

The screen is probably leaking the liquid crystal.

Look under Math>Probabilities. Symbol is nPr

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.

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.

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.

8 and 10. If this is homework, be sure to show your work.

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.

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. If you're trying to do something else when the error comes up, what are you trying to do?

24 quarters and 26 dimes.