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Press MODE. Use down-arrow to move to the "ANSWERS:" line and then use left/right-arrow to highlight "AUTO". Press ENTER to save the change, then 2ND [QUIT] to exit the mode screen.
The E is an engineering notation for 'x10^' so the answer there 4E-7 = 4 x 10^ -7 (I'm using the x as multiplication). I'm afraid there isn't a way of changing it (that I know of) but it is not difficult to learn, it's just a simple way of writing scientific notation!
Make sure you have the proper angular mode set. The TI-84 can work with degrees or radians.
Press MODE to bring up the mode screen. Use the arrow keys to highlight either "Radian" or "Degree" on the third line and press ENTER. Press 2ND [QUIT] to exit the mode screen.
If this doesn't do it, please reply to this post giving an example of a calculation and the answer you're getting from the calculator.
The comma key on the TI 84 SE is above the 7 key, and it is just left of (, right of x squared, and below SIN. thats where the "," key is. If you're asking something else, please clearify. My understanding is that you don't know where the comma key is.
Possibly beacuse the settings are different try changing it back so the settings on the mode that are on the left hand side except for the clock to be all highlighted.
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