18.6 Given the data X 1 2 H f(x) 3 6 3 19 5 99 7 291 8 444 18.14 Develop cubic splines for the data in Prob. 18.6 and (a) predict f(4) and f(2.5) and (b) verify that f₂(3) and f3(3) = 19.

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