In Google Classroom, how do I allow a co-teacher to view my assignment reports as well as create their own assignments in our shared classes?

First, ensure that the co-teacher is listed as a teacher in the relevant classes in Google Classroom.

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The co-teacher should then created an ASSISTments account with their Google Classroom login credentials.

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Next, they should attempt to assign any problem set and, when the reach the Assign options, select Google Classroom, click Import/Sync

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Next the co-teacher should choose Synchronize.  

Once this is done, the co-teacher will have the ability to assign to and review reports for your shared classes.