In the 2012-2013 school year , approximately 790,000 foreign students studied in country A. The number of country A students who studied abroad that same year was
about seven-twentieths of the number of foreign students who studied in the country A. Find the number of country A students who studied abroad during the
2012-2013 school year.

About country A students studied abroad during the 2012-2013 school year.

1- is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis. 2- 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. 3- 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 part b?