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$5183_w81_h21.png$ = ____

A 0.00066
Explaination
Multiplying a decimal value by 10 raised to a power is equivalent to moving the decimal point to the left or right the number of times indicated by the power.
In the case of a negative exponent, the decimal is moved to the left (this is the same as dividing by 10 a number of times).
In the case of a positive exponent, the decimal is moved to the right (this is the same as multiplying by 10 a number of times).
The negative exponent here, −4, indicates that the decimal point is to be moved to the left 4 places, $5183_w81_h21.png$ = 0.00066.
B 0.000066
C 0.0066
D 0.066