### Example 1

Find the 7 n – 1). |

### Example 2

Evaluate: |

### Example 3

Find the sum of -6, 0, 6,…, 66, 72 . Use the formula for a partial sum of an arithmetic series and simplify to find your final solution. |

Find the 7 n – 1). |

Evaluate: |

Find the sum of -6, 0, 6,…, 66, 72 . Use the formula for a partial sum of an arithmetic series and simplify to find your final solution. |