If the number is doubles its total is doubled since its total is itself!
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Te exponent would not change if the number is less than 5.
Assuming that the phrase "doubled by 2" is tautological, the expression for a number multiplied by 2 (or a number doubled) is 2n.
no it will not change, because if you double a number you dont usually get another "0" on the end
The answer gets doubled.
The effect on the total surface area of one dimension being doubled or tripled cannot be calculated. You either need to know all three dimensions or all three dimensions must be doubled, not just one dimension (or demension / demansion as you call them).