What number should be added to the expression x2 + 2x to change it into a perfect square trinomial?
a: 1
b: 2
c: 3
d: 4

answer: 1) twenty-seven times y

              2) twenty-seven multiplied by y

1/3 + 1/3 ≠ 2/6 because 1/3 alone = 2/6  

step by step explanation:

1/3 + 1/3 = 2/3       2/3=4/6