If you borrow 500$ for 6 yeras at an annual interest rate of 7%

Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u

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?

Linda loans her friend $250 with a 5% monthly intrest rate. how much was the whole loan?