This is two or more equations with common variables, also known as a linear system.

workers of lowell mills were greatly benefited for the waltham type of work which was more a paternalist kind, trying to protect the integrity of this little girls coming from small farmers and providing an adequate place of work, this in an effort to avoid the issues of bad place conditions and immorality that the people in bigger industrialized cities of great britain were experimenting.

a. theta waves. this is because the person is in a light sleep which means the brain waves would show these kind of waves.

i see, would you mind putting it as one?

a historian is attempting to study how the puritans affected society in new england