Any number x raised to a negative power -y is equivalent to the reciprocal of x raised to y. So, 10-73 would be the fraction 1 over the number 1 with 73 zeroes after it. A very small number indeed!
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Expressed as a mixed number in its simplest form, 73/10 is equal to 7 3/10 or seven and three tenths.
-73
73
-5/12 − 19/42 = -73/84
Neither, they are equal. One centigram equals 10 milligrams.