[fx] is a function of x, it usually used in graphs.
Math
The fx column in a Frequency Distribution Table is the frequency (f) multiplied by the Class Centre or score (x). If the score is 22. And the freqency for that score is 7. fx = 22*7 = 154 You can use the total of the fx column to find the mean. The total fx divided by the total frequency = Mean.
They are the same thing, Casio calls it FX-115ES in some countries, such as the U.S., and FX-991ES in most other countries. I believe this has to do with model name recognition. "FX-115" has been used in various U.S. models for a long time.
Depends on what Fx is.
No. You should look to the FX-9860GII for a graphing model that has Natural Input AND Natural Output on it's display.
Math
fx = effects = special effects
i think fx is channel 23
Fx means fracture
FX - Asia - was created in 2004.
Def FX was created in 1990.
Def FX ended in 1997.
Pinball FX happened in 2007.
Ciné Fx was created in 1996.
PC-FX was created in 1994.
FX Canada was created in 2011.
FX Australia was created in 2012.