Well since you asked this question you must of used the keys on your laptop/computer! So you must of had the sense to count them...Total Keys = 84, but it depends on what computer you have....
48+84+84=216
The total is 252
4 plus 80 = 84
420
Press the APPS button. You will see a list of all the applications that are currently on the TI-84 plus. Use the arrow keys to scroll down to the one you want to use and then press ENTER.
84
on a typical keyboard you can find 84 keys
96 plus 48 plus 84 is equal to 228.
26 plus 16 plus 84 is equal to 126.
84
84