The plural of a letter A would be "As" (where this was not likely to be read as 'as'), or A's (a rare proper case of using apostrophes to form plurals).
In algebra, double the value of the variable "a" is 2a.
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You get 24 if you double 12.
B sharp, C double-sharp, D double-sharp, E sharp, F double-sharp, G double-sharp, A double-sharp, B sharp.
wavelength
Multiply x2, then do it again.
146