There are multiple uses and application of negative numbers. They are used on a daily basis when describing temperature and in banking. For example, an overdrawn balance will be reported in negative amounts.
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It the two rational numbers have different signs, then the answer will be negative, otherwise it will be positive.
Never.
The quotient is negative.
Let x and y be two rational numbers. If both x and y are negative then their sum will be negative.If only one of them, say x, is positive (so that y is negative), and if the absolute value (or magnitude) of y is greater than x then their sum will be negative.
Find the arithmetic average of the two rational numbers. It will be a rational number and will be between the two numbers.