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Math Help - Could someone please check my answer to some simple questions?

  1. #1
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    Could someone please check my answer to some simple questions?

    Hi,can anyone check my answers for the following questions:


    My answers were:
    1. c
    2. A
    3. A
    4. A
    5. D
    6. B
    7. C
    8. D
    9. A
    10.c
    11.c
    12.D
    13.B
    14.B
    15.D
    16.C
    17.A
    18.B
    19.B
    20. D

    Thx
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  2. #2
    No one in Particular VonNemo19's Avatar
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    Quote Originally Posted by toprun91 View Post
    Hi,can anyone check my answers for the following questions:


    My answers were:
    1. c
    2. A wrong
    3. A
    4. A
    5. D wrong
    6. B
    7. C
    8. D
    9. A
    10.c
    11.c
    12.D
    13.B
    14.B
    15.D
    16.C
    17.A
    18.B
    19.B
    20. D

    Thx
    2 and 5 are wrong. So, what percent did you get wrong?
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  3. #3
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    Quote Originally Posted by toprun91 View Post
    Hi,can anyone check my answers for the following questions:


    My answers were:
    1. c
    2. A <<<<<<< I've got a different result
    3. A
    4. A
    5. D
    6. B
    7. C
    8. D
    9. A
    10.c
    11.c
    12.D
    13.B
    14.B <<<<<<< I've got a different result
    15.D
    16.C
    17.A
    18.B
    19.B
    20. D

    Thx
    ...
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  4. #4
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    Quote Originally Posted by VonNemo19 View Post
    2 and 5 are wrong. So, what percent did you get wrong?
    Yer srry 2. was a silly mistake i can now see it was 10 cents or answer c right? But r u sure about 5 i checked that about 10 times and think i am right. because D) gives 48 which is not 12. What did you get for 5 and why


    Quote Originally Posted by earboth View Post
    ..My answers were:
    1. c
    2. A <<<<<<< I've got a different result
    3. A
    4. A
    5. D
    6. B
    7. C
    8. D
    9. A
    10.c
    11.c
    12.D
    13.B
    14.B <<<<<<< I've got a different result
    15.D
    16.C
    17.A
    18.B
    19.B
    20. D

    Thx.
    I can see that 14 is not right and i think it could be a) but how do you work out a question like this. what i did was divided square root of 5 by 100 and squared it. Is that right?
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  5. #5
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    Quote Originally Posted by toprun91 View Post
    Yer srry 2. was a silly mistake i can now see it was 10 cents or answer c right? But r u sure about 5 i checked that about 10 times and think i am right. because D) gives 48 which is not 12. What did you get for 5 and why



    I can see that 14 is not right and i think it could be a) but how do you work out a question like this. what i did was divided square root of 5 by 100 and squared it. Is that right?
    Definitely no, because only the length unit is squared, not the amount.

    You are supposed to know that

    1\ m^2 = 100\ cm \cdot 100\ cm = 10,000\ cm^2

    Use proportions:

    \dfrac{x}{5\ cm^2} = \dfrac{1\ m^2}{10,000\ cm^2}~\implies~x=\dfrac5{10,000}\ m^2 = 0.0005\ m^2
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  6. #6
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    Quote Originally Posted by earboth View Post
    Definitely no, because only the length unit is squared, not the amount.

    You are supposed to know that

    1\ m^2 = 100\ cm \cdot 100\ cm = 10,000\ cm^2

    Use proportions:

    \dfrac{x}{5\ cm^2} = \dfrac{1\ m^2}{10,000\ cm^2}~\implies~x=\dfrac5{10,000}\ m^2 = 0.0005\ m^2
    is there any other way you could do it, that is a bit confusing? Also did I get 5 right?
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  7. #7
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    Quote Originally Posted by toprun91 View Post
    ... Also did I get 5 right?
    Right. (The trouble with those large images you used is that the divide-sign pretty much looks like a +)
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  8. #8
    Member Awsom Guy's Avatar
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    question 14 is definietly D. I am not precise with 2 sorry.
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  9. #9
    Member Awsom Guy's Avatar
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    And question 5 isn't wrong.
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  10. #10
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    Quote Originally Posted by Awsom Guy View Post
    question 14 is definietly D. I am not precise with 2 sorry.
    Are you sure 14 is D. I keep getting A. this is how i do it
    I figure 5cm^2 is the same as this:

    = 5cm^2


    So then i divided both by 100 converting it into meters:


    Then i multiply both sides to get it in square metres:


    and that is why i get A. Are you sure i am wrong. Why? maybe earboth knows
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