Use differences to find the degree of a polynomial fitting the data. Then use a system of equations to determine the polynomial model. Round to two decimal places where necessary. 1 2 4 5 6 7 8 P(x) -20 -39 -66-101-144-195 -254-321 A linear model fits the given data best, and its equation is: A quadratic model fits the given data best, and its equation is: [ A cubic model fits the given data best, and its equation is: [ A quartic model fits the given data best, and its equation is: [ x+ x² + x² +

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