Andrea has 8 books on her summer reading list . She has read 5 out of the 8 books. what percent does she have left to read! Pls help ASAP!!

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?

Which of the following is best modeled using a linear equation y=ax+b, where a is less than 0?

If each bricks costs and he can only buy one brick how much will it cost him to get the material to put around the outside of his garden?