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Secondary II • 1yr.

Hello, please help me by correcting my answers to the questions.Thank you

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Mathematics
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Explanations (1)

  • Explanation from Alloprof

    Explanation from Alloprof

    This Explanation was submitted by a member of the Alloprof team.

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    Team Alloprof • 1yr.

    Hi!


    The answer isn't 68 here :

    image.png

    You have two consecutive numbers, the first one would be x and the second one x+1. Their sum is 39. You can then pose the following equation :

    $$ x + (x+1) = 39 $$

    By solving this equation, you will find x, the first number. To find the second number, add 1 to the first number you just found.


    The answer isn't 6,87 here. I invite you to send us the details of your calculation so that we could help you find your error.

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    The following link may be very useful to you in the meanwhile : https://www.alloprof.qc.ca/fr/eleves/bv/mathematiques/la-resolution-d-equations-et-d-inequations-m1149


    Regarding number 4, we know that we have twice as many 0,25$ coins as 0,10$ coins. If we set x to be the number of 0,10$ coins, then 2x would be the number of 0,25$ coins.

    We also know that we have 30$ in total. You can translate this into the following equation :

    30$ = 0,10$ x nb of 0,10$ coins + 0,25$ x nb of 0,25$ coins

    $$30 = 0,10x + 0,25(2x) $$

    By finding x, you will find the number or 0,10$ coins. You will then be able to find the total number of coins.

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    For this number, you have to write the equation of the perimeter of the trapeze, which is :

    $$ 43 = 9 + 9 + x + (x-11) $$

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    You did not get the right answers in these two numbers :

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    Apart from these numbers, everything else is good, well done! :)

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