The sum of the first 10 terms in an arithmetic progression is 50 and the sum of the next 10 terms is 250. Find the 15th term

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?

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

How do you determine if an ordered pair is a solution to a given equation?