Complex Multiplication Advanced

Calculate

(5 + \frac{18 ⅈ}{11})

(18 + \frac{5 ⅈ}{7})

. Express your answer in the simplest form. [1] [0]

\frac{6840}{77} + \frac{2543 ⅈ}{77}

90 - \frac{90 ⅈ}{77}

90 + \frac{90 ⅈ}{77}

\frac{7020}{77} + \frac{2543 ⅈ}{77}