Respuesta :

Answer:

x=11

Step-by-step explanation:

because a each angle of a square or rectangle is 90° which means you add 9 to 90 and then divided 99 by 9 which is 11

Answer:

x = 11

Step-by-step explanation:

9x - 9 = 90

    + 9  + 9

9x = 99

9x/9  99/9

x = 11

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