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no a variable is anything that can change. a result is what you conclude after performing an experiment.
example:
ok let's say you want to test a new fertilizer you would most likely use two different plants in the same room using a different fertilizer for each plant. the variable would be the fertilizer and the result would be if the new fertilizer worked or not.
hope this helps.
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What is does independent variable mean in math terms?
The independent variable is the thing that stays the same throughout the problem.
What variable changes as a result of the independent variable?
dependent variable
What is the effect of keeping all variables exept the independent variable the same?
That will result in "replications" of the experiment.
What is a statistical variable?
In my humble opinion, what people mean with a statistical variable is the same as a random variable, which is explained well in wikipedia: http://en.wikipedia.org/wiki/Random_variable.
What is -8x minus 4x?
Since the variable is the same, you can use the distributive property for this one. That is, subtract -8 minus 4, and attach the variable, "x", to the result.
