International System of Units
Less than 6 units or more than 10 units.
If you mean the units, the most commonly used units are degrees, and radians.
a square 20 units long and 20 units wide
We cannot answer because we don't know what units you are talking about -- do you mean quarts, units of blood, units of insulin ... what? Please rewrite the question to say what units you want to know about.
The same units as the mean itself. If the units of the mean, are, for example miles; then the error units are miles.
what do you mean by input/ouput units?
International System of Units
I don't mean anything because I never used the term "units of measuring weight."
unit x unit = square units
Less than 6 units or more than 10 units.
Those are units of mass.
It is not clear what you mean with "units of power".
If you mean the units, the most commonly used units are degrees, and radians.
a square 20 units long and 20 units wide
if you mean, 3000microlitres, then yes. You need to state units of what?
If you mean a width of 5 units then the volume is: 9*5*6 = 270 cubic units