Find the sum 5.5+7.25-5.5+(-7.25) show your work

Because of your favorite lemonade it is $3.84 for 3 gallons. write this as an unit rate

Icould really use some with this question.

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?