Hi please help me finish the rest before the end of the quarter thanks

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?

5x−4≥12 or 12x+5≤−4 can you with this problem

What is the slope of the line passing through the points (-5, 7) and (-3,5)?