Loretta paid $6.70 for 5 cans of cat food and $10.72 for 8 cans of cat food. how much did 1 can of cat food cost

What is the value of x in the 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?

4+(2+x) can you me solve this problem