The egyptians developed an accurate 365 day calendar by basing their year on

Solar light.

Explanation:

The ancient Egyptians used a lunar calendar exclusively until they adopted their solar calendar. The lunar calendar was then used for their religious festivals and rituals, but for their daily lives, the ancient Egyptians used a solar calendar that contained 365 days per year.

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.

for this case we have the following equation:

we apply distributive property to the terms within parentheses.

subtracting 2 on both sides of the equation: