Asolar cooker is fashioned in the shape of a paraboloid of revolution. if it has a diameter of 1.00 meter and is 0.75 meters deep, what is the focal length (i. e. distance from vertex to the focus) of the cooker?

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?