This question is about using MATLAB, please plot the answers in MATLAB and include the MATLAB results.

9. Joe had decided to buy stocks of a particularly promising Internet company. The price per share was $100, and Joe subsequently recorded the stock price at the end of each week. With the abscissae measured in days, the following data were acquired: (0,100),(7,98),(14,101),(21,50),(28,51),(35,50). In attempting to analyze what happened, it was desired to approximately evaluate the stock price a few days before the crash. (a) Pass a linear interpolant through the points with abscissae 7 and 14. Then add to this data set the value at 0 and (separately) the value at 21 to obtain two quadratic interpolants. Evaluate all three interpolants at x=12. Which one do you think is the most accurate? Explain. (b) Plot the two quadratic interpolants above, together with the data (without a broken line passing through the data) over the interval [0,21]. What are your observations