Start with x2 + 4x = 12 and complete the square, what is the equivalent equation?

A) (x + 2)^2 = 16
B) (x + 2)^2 = 14
C) (x + 4)^2 = 16
D) (x + 4)^2 = 28

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .