To multiply something by a power of ten, as here, add 4 zeros after the nine (since the power is 4). In the case of a decimal (such as 9.14 times ten to the power 6), move the decimal point (in this example) six positions to the right, filling out with zeros where required.
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It is x1 which is x.
8.23 x 109 = 8,230,000,000
It is: (x-y)4
If you are trying do find out x it's 2. 2 to the fourth power equals sixteen.
Well, 10 = 2 x 5, so 10^4 = (2 x 5)^4 = (2^4) x (5^4). The carat[^] symbol means to raise to the power of.