Adealer bought an item for $ 7, sold it for $ 8, bought it back for $ 9, and sold it for $ 10. how much profi t did she make?

Which expression is equivalent to7_/x^2 ÷ 5_/y^3? assume y# 0

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?

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b