Building a 200 foot-long bridge across Scorpion Gulch, where the water is 8 feet deep, costs $700,000. Assume that the cost varies directly with the length of the bridge and directly with the square of the depth of the water.

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