The diameter of the average cell in the human body is 1 x 10-5 meters. the diameter of a grain of sand is about 2 x 10-4 meters. the diameter of a human hair is about 0.25 meters. what is the diameter of a human hair written in scientific notation?

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