Answer:
caffeine — independent variable
Explanation:
Independent variable: In psychological research, the term independent variable is defined as the variable that is changing, altered, and manipulated by the experimenter or the researcher. The independent variable is responsible for affecting the dependent variable in an experiment i.e, any changes in the independent variable will cause a direct effect on the dependent variable.
In the question above, the pair that correctly identify a variable in this experiment is the caffeine — independent variable.
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.
In this book, Jonathan Kozol wrote an ethnography of public schools in Chicago and its suburbs. Kozol argued that, because schools were funded by local property taxes, children in poor neighborhoods were necessarily trapped in poor schools. This system reinforces inequality. He also records the many differences between "poor" and "rich" schools," which included the difference in funding in arts and music and the number of foreign language teachers, nurses, librarians and psychologists.
Rivers, mountain ranges, historical points (railway, a wall, etc.)
Most country borders are divided by geographical points, and sometime just for political and historical reasons (what belonged, and waht should belong to whom).
Hope it helped,
Happy homework/ study/ exam!
The correct answer is individualism
Individualism is very different from selfishness. An individualistic person, is someone "anti social" who likes solitude, and prefers to be alone, read, listen to music, think and so on. That is, it is a personality characteristic.
