There is a certain number. if you add 30/7 to it, from the sum you get subtract 22/7 , and then subtract that difference from 59/7 , then you will get 19/7 . what is the certain number? ! i will award brainliest and , if a good answer !

What expression is equivalent to 42x-56y

Apool measures 12.3 feet by 16.6 feet. if the longer wall of the pool has a diagonal of 17.8 feet, what is the volume of the pool? (round to nearest tenth)

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?