Efficient means, Being effective without wasting time or effort or expense Able to accomplish a purpose; functioning effectively The Related Terms are: Effective, Efficacious.
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"Like terms" are terms whose variables (and their exponents such as the 2 in x2) are the same. In other words, terms that are "like" each other.
if you mean in terms of energy then it refers to a device that transfers more useful energy than it wastes if you mean in terms of energy then it refers to a device that transfers more useful energy than it wastes
In the absence of other information, it is the most efficient.
When you have an expression consisting of several terms added together, and they are not all like terms, and there are like terms separated by unlike terms, you use the commutative law of addition to rearrange the terms so that the like terms are next to each other.
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