Modeling in Continuous Time Lectures (#275)

* updated lectures

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Co-authored-by: mmcky <mamckay@gmail.com>
Co-authored-by: mmcky <mmcky@users.noreply.github.com>
Co-authored-by: Trang Truong <91804044+htrangtr@users.noreply.github.com>
Co-authored-by: Jesse Perla <jesseperla@gmail.com>