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10-2 is 0.01
5 to the power of minus 5 is equal to 1 divided by 5 to the power of 5. This simplifies to 1/ (5 x 5 x 5 x 5 x 5), which equals 1/3125 or 0.00032. This is because any number raised to a negative exponent is equal to 1 divided by that number raised to the positive exponent.
Raise a power to a power by multiplying the two exponents together; e.g. (x 2)3 is x6
x25 x10
It means to raise the number to the third power - that is, do a multiplication in which the number appears three times as a factor. For example, the cube (third power) of 5 is equal to 5 x 5 x 5.