The sign change key on the TI-83 Plus calculator is located on the bottom row of keys to the left of the ENTER key.
It is a white key with black printing that looks like this: (-)
You must use this key instead of the blue subtraction key when you need to indicate a negative number; otherwise, the calculator will tell you it doesn't understand what you mean ("syntax error").
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To find the additive inverse of any number, just change the plus sign (or no sign) to a minus sign, or (as in this case), if there already is a minus sign, change it to a plus sign (or no sign).
There is a button above the division sign that looks like this: ^ You type: 2^5 which means 25
In the simplest case, if there is a minus sign in front of a number, just take it away. If there is a plus sign, or no sign, no change is required.
The "times" sign is the "X" seriously? NOT ON WINDOWS 7! Lier...
I have no clue.....lol