Perry County is also a part of the larger Harrisburg-York-Lebanon, PA Combined Statistical Area (CSA), which combines the populations of Perry County as well as Adams, Cumberland, Dauphin, Lebanon and York Counties in Pennsylvania.
In mathematics, a function is a relation between a set of inputs and a set of permissible outputs with the property that each input is related to exactly one output. An example is the function that relates each real number x to its square x2.
one of the most used functions in mathematics is the absolute value function some of its properties are given below the absolute value function is used to measure the distance between two numbers distance between x and 0 is jx 0j jxj and the distance between x and y is jx yj thus the distance from 2 to 4 is j 2 4 j j 2 4j j2j 2 and the distance from 2 to 5 is j 2 5j j 7j 7 the following properties of the absolute value function need to be memorized