The graphs below show four functions: graph a shows function f of x equals 3 multiplied by 3 to the power of x. graph b shows function f of x equals 9 to the power of x. graph c shows function f of x equals 3 multiplied by 3 to the power of negative x. graph d shows function f of x equals 9 to the power of negative x. which graph best shows the function f(x) = 3(3)−x to represent the rate at which a radioactive substance decays? (1 point)

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