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  1. February 12, 1812

    Explanation:

    The current flag of Argentina was officially adopted on February 12, 1812. The light blue stripes upon a white field were placed on the flag by Manuel Belgrano, the leader of the revolution, and are said to be symbolic of the sky above, when the fight for the country's independence began.

  2. The system of equations representing the system is:

    25c + 40p = 445

    20c + 35p = 380

    Step-by-step explanation:

    In order to solve this problem, we call:

    c = the price of one cup

    p = the price of one plate

    We know that:

    - Lara bouthg 25 cups and 40 plates, and she paid a total of $445.00. So, this means that

    25c + 40p = 445 (1)

    - Luis bought 20 cups and 35 plates, and he paid a total of 380.00$. So, this means that

    20c + 35p = 380 (2)

    We can therefore solve the system of equations to find the price of each cup (c) and of each plate (p). By multiplying the first equation by 4 and the 2nd equation by 5 we get:

    100c + 160p = 1780

    100c + 175p = 1900

    Substracting the 1st equation from the 2nd one,

    15p = 120

    Which gives

    [tex]p=\frac{120}{15}=8[/tex]

    And substituting into (1),

    [tex]25c+40(8) =445\\25c=445-320\\25p = 125\\p = \frac{125}{25}=5$[/tex]

    Learn more about systems of equations:

    #LearnwithBrainly

  3. 27 february 1812.

    Explanation:

    On February 27, 1812, General Manuel Belgrano, in the ravines of Rosario, on the banks of the Paraná River, flew the Argentine flag for the first time. He did it during the deed for the Independence of the United Provinces of the Río de la Plata.

    Its blue and white colors come from the national cockade. History tells us that the original flag has been lost and some versions speak of having two stripes; others say they were three but it is not clear what their disposition was.

    Belgrano first raised the flag next to the Libertad y Independencia batteries and was sworn in by the soldiers.

    Communicating this fact to the Triumvirate, Belgrano left to take charge of the army of the North, without knowing that the public body denied him the possibility of using the new flag, due to the difficult situation prevailing.

    Only after July 9, 1816, once the independence of the United Provinces of the Río de la Plata was declared, more precisely on July 20, its official use was approved by Congress.

    Good luck!

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