JUST THE SECOND ONE EASY PLS ASAP

What are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m

What is the base of 1/9 to the power of 2

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?