Using only a pencil and paper, write a cubic polynomial function that could represent the curve shown (here, x represents the distance, in feet, along the horizontal axis from the western base of the hill, and H(x) is the height, in feet, of the land at that distance from the western base). Be sure that your formula satisfies H(400) = 1500.

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