Today, isaac needs to walk his dog, water the garden, and feed his fish. d is the number of minutes it takes to walk his dog, g is the number of minutes it takes to water the garden, and f is the number of minutes it takes to feed his fish.
the expression g+(d+f) describes the total number of minutes it takes issac to do all three task. we can also use the expression (g+d)+f to represent the same quanity

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?