Same rules as adding whole numbers with different signs.
No.
Consider the absolute values (the numerical values ignoring the signs) of the two numbers. If these are equal then the sum is equal; otherwise the sum takes the sign of which ever number has the larger absolute value.
The numerical value is the same as the quotient of the two positive equivalents but the sign is always negative.
Positive.
sometimes true (when the rational numbers are the same)
It the two rational numbers have different signs, then the answer will be negative, otherwise it will be positive.
Same rules as adding whole numbers with different signs.
The quotient is negative.
No.
No; depends on the signs of the rational numbers.
You could be adding numbers that have different signs. Just a guess.
Consider the absolute values (the numerical values ignoring the signs) of the two numbers. If these are equal then the sum is equal; otherwise the sum takes the sign of which ever number has the larger absolute value.
The sign of the sum is positive when the absolute value of the positive addend is greater than that of the negative addend.
The numerical value is the same as the quotient of the two positive equivalents but the sign is always negative.
Positive.
Adding two numbers with different signs means subtracting the two absolute integers (without sign) and vice versa.