What are first differences? When given a function or a table of values representing a function, looking at the first difference can help you determine what kind of relationships there is between the variables and hence what function the points represent. There are also second and third differences but here we will focus on first differences.
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The length of a line is not necessarily a practical value as a line goes on for ever. The length of a line is infinite. However, the length of a line segment is of more value and is a finite value. Any time we measure how long a package is or how long our table is, we are taking the length of a line segment. Learn the formula for finding the length of a line segment when given two points in either 2 dimensions or in 3 dimensions.