Final answer:
The property used to rewrite the expression log618-log66=log63 is the Quotient Property.
Step-by-step explanation:
The property used to rewrite the expression log618 - log66 as log63 is the Quotient Property. The Quotient Property of logarithms states that the logarithm of the division of two numbers is equal to the difference of the logarithms of the two numbers. In this case, log618 divided by log66 can be simplified to log63 using the Quotient Property. Therefore, the correct answer is d) Quotient Property.