There is not really much to "solve". I suppose you mean 1.3 x 10-12. This is scientific notation, a convenient way to write very large or very small numbers. To change this into standard notation, move the decimal point in 1.3 12 positions to the left (adding digits if necessary). For a positive exponent, move the decimal point to the right. Thus, 1.3 x 10-12 = 0.0000000000013. However, it is better to learn about scientific notation, and just keep such large or small numbers in scientific notation, since that is much easier to read.
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5.0009 x 1012 = 5,000,900,000,000
x=13
To solve for x, we'd have to know what this expression equals.
0.09 x 1012
You divide the number of miles by six trillion (6 x 1012).You divide the number of miles by six trillion (6 x 1012).You divide the number of miles by six trillion (6 x 1012).You divide the number of miles by six trillion (6 x 1012).