Express the following using summation notation 1. Yı + y2+ Y3+ y4+ Ys+ yo
2. (x,-5) + (x2-5) + (x3-5) + (x4-5) + (x5-5)
3. x + xy + xgt x7

State one method by which you can recognize a perfect square trinomial.

A6 ounce bottle of dressing costs $1.56 a 14 ounce bottle costs $3.36 a 20 ounce bottle costs $5.60 which has the lowest cost per ounce

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