What number adds up to 8 and multiply up to 14

Two lines parallel to a third line are parallel to each other. always sometimes or never

For how answer my question this will be the last question can you answer in math subject

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?