Two positive integers cannot have a sum which is negative!
Yes
The product is 30.
They are: 78 and 63
8 and 7.
-- Their sum and difference both have the same sign that the two integers have. -- Their product and quotient are both positive.
Yes
No. Two negative integers added together will never equal a positive integer. It is the product of two negative integers that is positive.
The product is 30.
7 and 8?
5 and 7
They are: 78 and 63
8 and 7.
-4 and -6
-- Their sum and difference both have the same sign that the two integers have. -- Their product and quotient are both positive.
8+4=12
The product of the two integers is -80.
The sum of two negative integers is never positive.