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The minus sign indicates that the value is on the right hand side of the decimal. So where as 103 is 1000, 10-3 is 0.001. Another way to look at it is that the minus makes 10-3 the same as 1/103 or 1/1000 which is the same as 0.001
To the power of, -fold (threefold in this case) is the amount of times a anumber is muktiplied by itself. Therefore, to answer your question 10^3 = 10 x 10 x 10 = 1000
103 = 1,000
10 to -3 power = 7
3^10 = 59049
10 to the 4 power times 10 to the 3 power is 10,000,000 (10 million).
10 to the 3rd Power = 10^3; 2.232*10^3 = 2232
10 to power of -7 = 3