7. Simplify by combining like terms.
3x - 57 - 2 + 6

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?

In a column proof the right column states your reasons

Evaluate each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42