I checked your problems.
Here is the solution to your two questions.
To insert an equal sign in an equation on the Casio FX-115ES one uses the key combination [ALPHA][CALC] (=).
To insert other variables (A,B,C,D,X,Y) you do as follows
[ALPHA][(-)] (A).
[ALPHA][' " "] (B).
[ALPHA][hyp] (C).
[ALPHA][sin] (D).
[ALPHA][ ) ] (X).
[ALPHA][S<=>D] (Y).
The only other uses of the [ALPHA] key are
[ALPHA][Integral] (:)
[ALPHA][M+] (M) to access constant memory register
[ALPHA][x10^x] (e) to access value of the base of the natural logarithm.
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