Please help me on this problem
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Find the value of x that will make l ll m

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.  

Let x = a + bi and y = c + di and z = f + gi. which statements are true?