I NEED TO INPUT 20% IN MY TI-84

SOURCE: TI-84 Plus Calculator Factoring Program

Hi,
There 4 or 5 programs for the TI83/4Plus family of calculators available at ticlac.org. Scroll down the page to find them. Download them and transfert to your calculator using TIConnectivity software.

Hope it helps.
Thank you for using fixYa and for rating the solution.

SOURCE: Change TI 84 OS to TI 89 OS??

And why, pray tell, would you do such a thing? You will ruin your Ti84 Plus Silver Edition and will not have a working TI89. Besides, TI connect will refuse to transfer it.
If you like the capabilities of the TI89 Titanium, buy a cheap or used one on e-bay or amazon.com and spare your TI84PLus SE.

SOURCE: Can you Factor on a TI-84? IF not, does the TI-89?

Well, to answer part of your question, yes... the TI-89 does factor like this. it is inputted like this:

factor(6*x^2+11*x+4,x)

Check the catalog in the TI-84 (which is 2nd-zero) and look under F for factor()

SOURCE: TI 84 won't graph more than one function

If you have used or just run the Transfrm Application, you will no longer be able to draw more than one graph.
To restore the native OS graphing capabilities Uninstall the Transfrm Application. Here is how to do it.

1. Press the [APPS] key.
2. Scroll Up to reach the bottom of the list faster.
3. Point to Transfrm and press [ENTER].
4. Select [1:Uninstall]
   

SOURCE: how do I use the intersect function on the TI-84

1. You draw two or more graphs.
2. After the graphs are displayed, press [2nd][TRACE] to access the (CALC)ulate menu.
   
3. Select [5:Interesct]
4. You will be prompted for a first curve: the equation of the curve will be displayed at the top left corner of the screen. If it is one the intersecting curves, press [ENTER]
5. You will be prompted for the second curve. (You can move from one curve to another by pressing the UpArrow or DownArrow).
6. After two curves are selected, you will be prompted for a guess for the X-value of an intersection point: you can use the keypad to enter a guess or use the left or right arrow to move the cursor towards a point of your choosing (if there are more than one point).
7. After a short while the calculator gives you a solution.
8. If it fails, you must make a better guess.