{
 "metadata": {
  "name": "expressions"
 }, 
 "nbformat": 2, 
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "markdown", 
     "source": [
      "Expressions", 
      "===========", 
      "An expression is a command that returns a value. For example, if our command adds two numbers together then the valued returned is their sum."
     ]
    }, 
    {
     "cell_type": "code", 
     "collapsed": false, 
     "input": [
      "2 + 2"
     ], 
     "language": "python", 
     "outputs": [
      {
       "output_type": "pyout", 
       "prompt_number": 1, 
       "text": [
        "4"
       ]
      }
     ], 
     "prompt_number": 1
    }, 
    {
     "cell_type": "markdown", 
     "source": [
      "If the command is to get the absolute value of a number, it returns the absolute value."
     ]
    }, 
    {
     "cell_type": "code", 
     "collapsed": false, 
     "input": [
      "abs(-2)"
     ], 
     "language": "python", 
     "outputs": [
      {
       "output_type": "pyout", 
       "prompt_number": 2, 
       "text": [
        "2"
       ]
      }
     ], 
     "prompt_number": 2
    }, 
    {
     "cell_type": "markdown", 
     "source": [
      "The order of operations for mathmatical operations is the standard order."
     ]
    }, 
    {
     "cell_type": "code", 
     "collapsed": false, 
     "input": [
      "3 + 5 * 2"
     ], 
     "language": "python", 
     "outputs": [
      {
       "output_type": "pyout", 
       "prompt_number": 3, 
       "text": [
        "13"
       ]
      }
     ], 
     "prompt_number": 3
    }
   ]
  }
 ]
}