please explain

Given the data (0,0) . (2,2) . (3,6) , (4, 12) (a) What degree polynomial can we find that goes directly through all four data points. Degree 3 (cubic) (b) Find the polynomial p (r) that goes through all four data points. P(2) =0-x+1+013 =-I+1 (c) Find the least squares regression line q (x) = co + cir for these data points. _10 20 9(I) =-7 (We covered this material as part of chapters 1 and 2, but in the book, it occurs in section 5.4 just after Gram-Schmidt. I put a problem here just as a reminder.)