What is the quadratic regression equation for the data set?

yˆ=-0.004x2+0.415x-0.546

yˆ=-0.004x2-0.415x-0.546

yˆ=0.004x2+0.415x+0.546

yˆ=-0.004x2-0.415x+0.546

x y

50 10

30 11

11 5

35 9

50 12

20 3

90 7

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How to model the expression (t-9) ?