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Which type of graph would allow us to compare the median number of teeth for mammals and reptiles easily

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.  

Look at the graph of f(x) = sin 1/x. is this function periodic? why or why not?