updated model number.

mv demos into public from internal

Closes #4

See merge request !10

updated text formatting 

reworded to be easier to understand what was expected

Resolve "update student activities"

Closes #3

See merge request !9

Add student guide to public

Closes #2

See merge request !8

Revert "Add new directory"

See merge request !7

This reverts commit 8c6379ad

Ps move activities to public for easier access by students and inclusion into private Field Guides

See merge request !5

Update arrays_and_math.adoc added code sample needed to generate the file.txt file with data for processing in the activity