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As a number, it means 16+8+1, or 25 in decimal
11 and 7 (if you mean two separate 4-digit binary numbers) or 227 as one 8-digit binary number.
In binary this would be written as 1011. This is because in binary (from right to left) the digits in this number mean: (1 * 20) + (1 * 21) + (0 * 22) + (1 * 23). This, of course, is equal to (1 * 1) + (1 * 2) + (0 * 4) + (1 * 8), which equals 1 + 2 + 0 + 8, which equals 11 (in decimal).
There are different meanings depending on the context: plane shapes, 3-d shapes, exponents, logarithms, counting systems (decimal, binary etc).
If you mean "How to convert binary 42 to base 10" then it is not valid.Binary numbers have primitive symbols of 0 an 1 and thus 42 is not binary