Emily is three years older than twice her sister mary’s age. the sum of their ages is less than 30.

let x represent mary's age.

which inequality represents mary’s possible age?

a. 0 < x < / = 9
b. 0 < x < / = 18
c. 0 < x < 18
d. 0 < x < 9

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