Which set of ordered pairs in the form of (x, y) does not represent a function of x?

a. (0,2), (1,-1), (2,3), (3,-2)

b. (0,-2), (1,1), (2,3), (3,-2)

c. (0,2), (-1,-1), (2,-3), (3,2)

d. (0,2), (1,2), (1,-2), (3,2)

Find the answer in vertex form. y=x^2-6x+7

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Corsi et al. (2007) conducted a study of the factors mediating whether injection drug users enter a drug treatment program. In their sample of 491 drug users, 38.1% were single; 27.5% were married or had a partner; and 34.

The sum of 3 consecutive even numbers is 42. The sum can be respresented by n + (n+2) + (n+4) = 42. What does n represent?

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