Grace is traveling to an island for vacation. she drives from home at a constant rate for the first 154 miles, then takes a ferry to travel the last 35 miles from the coast to the island. the ferry travels at a constant rate that is half the rate at which grace drives. given that the entire trip takes 4 hours, complete the statement below. grace drives at a rate of miles per hour.

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