Real quick. Using Ubuntu Linux commands do this

sudo su -

Create 3 new groups:

cs

math

science

Create 2 new users named steve and lucy with the following attributes:

default shell is /bin/bash

comment (GECOS) field contains full names (Steve Smith / Lucy Goosey)

steve primary group = math additional group = science

lucy primary group = cs additional group = science

Make your own account members of all three groups.