Michelle and her brothers sam and dean are saving money over summer break each week michelle saves three times as much as sam sam saves $2 more than dean at the end of 5 weeks the three of them have saved a total of 240 how much money did each person spend

Which of the following expressions is equal to 2x^2+8

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?

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?