Suppose that e is the unit cube in the first octant and f(x, y, z) = < −x, y, z> . let s be the surface obtained by taking the surface of e without it’s top (so s has five sides). calculate rr s f · ds directly and by using the divergence theorem.

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