Final answer:
The number 793.00 as a mixed number is 793 1/100, since the decimal .00 equals 1/100, which when expressed as a fraction is zero parts.
Step-by-step explanation:
To determine what 793.00 is as a mixed number, we need to understand that this number is already a whole number with a decimal part of .00, which represents zero parts of any fraction. Since there are no parts beyond the whole number, the mixed number is simply the whole number 793 with no fractional part. Therefore, the correct answer is a) 793 1/100, since 1/100 is equivalent to .00 in decimal form but expressed as a fraction for the sake of formality in a mixed number format.