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How do you compute the coefficients for n-dimensional linear regression? What is the golden ratio? If two lines, in standard, are A1x + B1y = C1 and A2x + B2y = C2, what is the relationship of A1, A2, B1, and B2 if the lines are parallel? Factor: 2x^3+8x^2-24x? Explain the purpose of the holes in the sieve plate at the ends of each sieve tube cell?