Answer:
2.22 hours
Explanation:
If Sally can paint the office by herself in 5 hours, we can say that in one hour she paints 1/5 of the office.
On the other hand, Lucy paints the office in 4 hours, which means that, in 1 hour she paints 1/4 of the office.
Therefore, to know how much they would paint per hour working together, we are going to sum up the fractions they paint per hour:

Therefore, working together they will paint
of the office in one hour.
Now we can establish a rule of three: if they paint 0.45 of the office in 1 hour, how long (x) will it take them to paint 1.0 of the office?

And therefore 
Therefore, it will take them 2.22 hours to paint the office working together.
Answer:
The correct answer is - option B. Whether the Twitter user provided #SorrySorrySorry (for the sincere condition), #SorryNotSorry (for the insincere condition), or #WhatsDoneIsDone (for the no apology condition).
Explanation:
An independent variable is a variable in any experiment is that leads to the changes to the dependent variable. The independent variables are subject to change to know what changes occur to the experiment.
The independent variables are stand-alone in specific conditions and would not change by the other variables the investigator tries to analyze. In this case, the Twitter user provided three different hashtags for three different conditions.
The Persian Empire is the name given to a series of dynasties centered in modern-day Iran that spanned several centuries—from the sixth century B.C. to the twentieth century A.D. The first Persian Empire, founded by Cyrus the Great around 550 B.C., became one of the largest empires in history, stretching from Europe’s Balkan Peninsula in the West to India’s Indus Valley in the East. This Iron Age dynasty, sometimes called the Achaemenid Empire, was a global hub of culture, religion, science, art and technology for more than 200 years before it fell to the invading armies of Alexander the Great.
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