李英

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  • Infinite Geometric Series
    Activity

    Infinite Geometric Series

    Joel T. Patterson

  • Border Tile
    Activity

    Border Tile

    gigigroovy

  • 3 Squares
    Activity

    3 Squares

    Steve Phelps

  • Relative velocity: Boat problem
    Activity

    Relative velocity: Boat problem

    Juan Carlos Ponce Campuzano