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A researcher listened to a person’s heart for a portion of a minute and recorded the number of beats she heard in the table below. From that, she calculated the number of beats per minute, also shown in the table. <a href=" http://tinypic.com?ref=25rdzwp " target="_blank"><img src=" http://i55.tinypic.com/25rdzwp.jpg " border="0" alt="Image and video hosting by TinyPic"></a> Which equation can be used to calculate the beats per minute ( B ) based upon the number ( N ) of beats heard?

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