15
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There are infinitely many possible answers:add 8multiply by 2 and subtract 1multiply by 3 and subtract 10multiply by 4 and subtract 19etc are all possible rules.
You can subtract 2 from 21 a total of 10 times. This is because each time you subtract 2, you are left with 19, and you can repeat the process until you reach 1. Mathematically, this can be represented as 21 - 2 = 19, 19 - 2 = 17, and so on until you reach 1.
57
It is: (5*12)-2 = 58
Just write it as 2 to the power n. You can't simplify that, and you can only calculate a specific value if you know the value of n.