Explain how you can use the rules for dividing a negative number by a negative number to determine the sign of the quotient - 0.3-0.05.

Well, the main rules for negative numbers are that a negative combined with a negative always makes a positive. This rule applies almost everywhere, except subtraction. So, the rule also applies in division. So no matter what, if you divide a negative number with a negative number, the answer should always be positive.