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# Math chapter 2

### vocab

Question | Answer |
---|---|

natural numbers | The sets {1,2,3...} |

whole numbers | The set {0,1,2,3,...} |

integers | The set {...-2,-1,0,1,2} |

positive numbers | Any value that is greater then 0 |

negative numbers | Any value that is less then 0 |

rational numbers | The set of numbers expressed in the form of a fraction a/b, where a and b are integers and b is not equal to zero |

graph | To draw , or plot, the points named by certain numbers or ordered pairs on a number line or coordinate plane. |

coordinate plane | The plane containing the x and y-axis. |

absolute value | The absolute value of a number n is its distance from zero on a number line and is represented by I n I |

opposites | Every positive rational number and its negative pair. |

additive inverse | A number and its opposite are additive inverses of each other. The sum of a number an its additive inverse is 0. |

line plot | A number line labeled with a scale to include all the data with an x placed above a data point each time it occurs. |

frequency | How often a piece of data occurs |

stem-and-leaf plot | A system used to separate data into two numbers that are used to form a stem and a leaf. |

back to back stem and leaf plot | Used to compare to related sets of data |

measures of central tendency | Numbers or pieces of data that can represent the whole set of data |

probability | The ratio of the number of favorable outcomes for the event to the number of possible outcomes of the event. |

simple event | a single event |

sample space | The list of all possible outcomes. |

equally like | outcomes for which the probability for each occurring is equal |

odds | the ratio that compares the number of ways an event can occur to the number of ways an event cannot occur. |

square root | one of two equal factors of a number |

perfect square | a number whose square root is a rational number |

radical sign | The symbol used to indicate a nonnegative square root. |

principle square root | the non negative square root of a number |

irrational numbers | numbers that cannot be expressed at terminating or repeating decimals |

real numbers | The set of rational numbers and the set of irrational numbers together. |

completeness property | states that each point on a number line corresponds to exactly one real number |

rational approximation | A rational number that is close to , but not equal to, the value of an irrational number. |

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hgkaduson