Please solve it doesn't matter how much you can solve just solve best you can and atleast 1 please

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

1- is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis. 2- 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. 3- 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 part b?

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b