Help i am going to fail my end of semester test

Which of the following statements is true? a. the irrational number system is not closed under multiplication, because the product of two irrational numbers is always a rational number. b. the irrational number system is not closed under multiplication, because the product of two irrational numbers is not always an irrational number. c. the irrational number system is closed under multiplication, because the product of two irrational numbers is always an irrational number. d. the irrational number system is closed under multiplication, because the product of two irrational numbers is always a rational numbers. reset submit

If the function m(x) has the point (5,2) on its graph name a point that would be on the funtion m(5x)

If y varies as x, and y=8 as x=4 what will be the value of y if x=2