2.87 x 102 = 287
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287 = (2 x 100) + (8 x 10) + (7 x 1)
Just X to the second power minus nine. You can't subtract nine from x to the second power unless you know what x is.
To break it down: 1 x 10 = 10 10 to the power of 4 = (((10 x 10) x 10) x 10) 10 x 10 = 100 100 x 10 = 1,000 1,000 x 10 = 10,000 Answer: 10,000
1.0 x 10 to the power of 10 or 1.0 x 1010 can be written in standard form as 10,000,000,000 (10 billion).
1 (: cause x=1x to the 2nd power is the same as x2 (x squared) or x*x