Explanation:
Distance is a numerical
description of how far apart objects are. In physics or everyday discussion, distance may
refer to a physical length, or estimation based on other criteria (e.g.
"two counties over"). (Our solved example in mathguru.com uses this concept)
In most cases, "distance from A to B" is interchangeable
with "distance between B and A".
http://en.wikipedia.org/wiki/Distance
Addition
Addition is a mathematical operation that represents combining
collections of objects together into a larger collection. It is signified by
the plus sign (+). (Our solved example in mathguru.com uses this concept)
For example, if
there are 3 + 2 apples-meaning three apples and two other apples-which is the
same as five apples. Therefore, 3 + 2 = 5.
Notation
and terminology
The plus sign
Addition is written using the plus
sign "+" between the
terms; that is, in infix notation.
The result is expressed with an equals
sign. For example,
1 + 1
= 2 (verbally,
"one plus one is equal to two")
2 + 2
= 4 (verbally,
"two plus two is equal to four") (Our solved example in
mathguru.com uses this concept)
http://en.wikipedia.org/wiki/Addition
The above explanation is copied from
Wikipedia, the free encyclopedia and is remixed as allowed under the Creative
Commons Attribution- ShareAlike 3.0 Unported License.