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19. Let B be given as on problem 10 and let y = . Find the distance from y to ColB. 20. Use a system of normal equations to find the line of best least squares fit for the data (-1.4,3.7), (0.3, -1), (1,2.8) and (2.1,4.2). Plot the points and the best fit. 21. Use a system of normal equations to find the quadratic of best least squares fit for the data (-2.3,4.88), (-0.9,2.8), (-0.2,0.8), (1.6,1.1) and (3.3,3.9). Plot the points and the best fit. 22. Use a system of normal equations to find the best fit of the form ax + bsin(x) for the data (-2.8,-0.9), (-1.8,0.4), (-0.5,0.1), (0.8,-0.1), (1.7,-0.5), (3.1,0.5), (3.9,2.1), (4.9,1.9), (6.3,2.1). Plot the points and the best fit. 23. Suppose we need more data related to the data in problem 20, but we can't rerun the experiment that created the data. Use the solution to problem 20 to estimate the value of y associated with x = 1.2. 24. Suppose we need more data related to the data in problem 21, but we can't rerun the experiment that created the data. Use the solution to problem 21 to estimate the value of y associated with x = 1.3. 25. Suppose we need more data related to the data in problem 22, but we can't rerun the experiment that created the data. Use the solution to problem 22 to estimate the value of y associated with x = 1.4