"Unit used" basically means, what you are measuring in.
For example, if you are figuring out the distance between New Your and Miami, you don't use pounds, you use miles. "Miles," is the unit used.
Typical units is middle school, high school, and basic college mathematics might include inches, centimeters, feet, meters, and other forms of distance measurement; or, seconds, hours, minutes, and other forms of time measurement.
You might also find an answer like "60 cells" or "90 Miles per hour."
Sometimes there is no unit listed, so you just write "20 square units" or "seventeen units" to show you understand that the answer is a measurement of something.
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Assuming that oz means ounces, then they are a unit of measurement (weight, unless you mean fluid ounces, then volume) and so they are used in practical, applied problems.
⇒ is used for material implication i.e. implies; if .. then
Regrouping in math with decimals simply refers to the term used addition or subtraction when either carrying or borrowing is involved.
Math used to be called Arithmetic.
math can be used in almost everything!how is it used graph's for the weather