It could be: 21n2-4
82
One way or another
Regular Expression is another way of implementing a lexical analyzer or scanner.
additional cost
That one, there!
X and o
That Would Be 300k
32 = XXXII
162 = 256
It means another way of expressing precisely the same thing.
Chemical formulas are a shorthand way to represent chemical compounds. For example, CO2 is quicker to write than carbon dioxide.
The answer depends on what the first way is. I would suggest -25