Which of the following relations is a function? OA. (-1, 11), (-9, 2), (-1,9), (-9, -6)
OB. (6, 11), (-9, 2), (-1,9), (-6, 11)
OC. (6, 11), (-9, 2), (-1,9), (-1,-6)
OD. (11,6), (2, -9), (9,-1), (11, -6)

step-by-step explanation:

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a

easy its decreasing

step-by-step explanation:

because its top point is at the to of the graph on the left side (atleast from the veiw i see it) now if that top point wast in the lower part of the graph it would be increasing hope this have a nice day