Is the line through points P(0.-9) and Q(2,-8) perpendicular to the line through points R(1.4) and S(5,-1) ? Explain. No, the lines have same slopes. No, the lines do not have negative reciprocal slopes. Yes, the lines have same slopes. Yes, the lines have negative reciprocal slopes. < Previous Next >

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