EXTREMES
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extremes
The two outer terms of a proportion are known as extremes. These are the limits of a range of possibilities.
Use the "F-O-I-L" Method when multiplying two binomials. F-O-I-L stands for First, Outer, Inner, Last. Multiply the first terms together, then the outer terms, the inner terms, and the last terms.
... a proportion.... a proportion.... a proportion.... a proportion.
There cannot be a "proportion of something": proportion is a relationship between two things, and how you solve it depends on whether they (or their transformations) are in direct proportion or inverse proportion.