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• Exam 2: The median and average are 60. The top 25% of the scores are between 100 and 81, the next 25% between 81 and 60, the next 25% between 60 and 49, the bottom 25% between 49 and 3.
• Hints for problem 2: It is easier to see the behavior of the vector field if you use vectfieldn (download vectfieldn.m) which plots the vectors normalized to length 1. It may be helpful to look at Using Matlab for Autonomous Systems (the part before ``Investigation of critical points'').
• Read Using Matlab for Higher Order ODEs and Systems of ODEs for instructions on plotting solution curves in the y<sub>1</sub>-y<sub>2</sub> plane and plotting vector fields using vectfield
• Read Solving ODEs using the Laplace Transform in Matlab and use this method to solve some example problems (from class or the recommended homework) with Matlab. I recommend that you use this method rather than the method described in ``Differential Equations with Matlab''.

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