It is basically this: "What are you using that changes the experiment?"
A controlled variable is one that remains the same throughout the experiment, i.e., it is not changed
Reasonable or capable. Example my tv is completely vaiable.
a variable that depends on another force
They are all variables (or possibly, vaiables!).
Total Variable Cost divided by Quantity of Output
Y is the response variable and it goes on the vertical axis.
Your experiment should show what the effect of a variable is on the outcome of the experiment. If you have two variables, you don't know which variable contributed what to the outcome. For example: if want to see the effect that temperature has on water, you'll want to vary your temperature (temperature is a variable) and record your observations on the water. If nothing else is varied during your experiment and you do this experiment in your kitchen at sea level, then you may learn for instance that as you bring water temperature up from -60C to 0C it melts . If, however, you also vary your pressure (pressure is a SECOND variable) during this test, then you may find that if your pressure is 100Pa, as you bring water from -60C, it turns to vapor at ~25C!
It's dificult to budget for vaiable expenses because variable expenses change based on a number of factors.
You should consider life insurance that covers you for the amount you need. Term life insurance is one form of coverage.
Indoor hammocks are a vaiable option if you have the right available space. You should always make sure that you check the dimensions of the hammock and that it fits the space you have available.
Life is an experiment. When you die, that experiment is over.