Determine theintervals where the slope is negative

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

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?

A(1,1) b(-3,0) c(-4,-1) d(3,-2) drag it to correct position