10-4 = 1/104 = 0.0001
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-4 - 6 - (-10) = 0
10-4 means the same as 1/104 or in other words 1/10000 = 0.0001
10^2 minus 4 times 8 divided by 8 plus 9 is equal to 105.
10 to the power of minus 2
10 to the power 3 means 10*10*10, or 1000 10 to the power MINUS 3 means 1 over 10 to the power 3, so 1/1000.