Do the following points belong to the graph of the function f(x)=-xto the power of 2+10? (-1,9)

Which is the completely factored from of xy^3-x^3y

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

Simplify each expression for 18, 20, and 21