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Math Help - Miscellaneous questions.

  1. #1
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    Miscellaneous questions.

    I have an exam on tuesday and if i fail i will repeat the same grade so i really need your help with some questions.. I need the answers and working out also:

    NOTE: They are not 'all' algebra

    1) Work out 7-5x(6-1).
    2) Tiago's father buys a car for $18500.
    During the first year its value falls by 20%.
    Calculate its value at the end of the first year,
    3) Tiago buys a bicycle for $ 240.
    During the first year it loses 13/40 of its value.
    Calculate its value at the end of the first year.
    4) The nth term of a sequence is given by the formula
    n2(squared)
    ------- (over)
    n+1

    find (i) the 9th term,
    (ii) the 99th term


    Thank you.
    Last edited by mr fantastic; September 4th 2010 at 02:33 PM. Reason: Re-titled.
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  2. #2
    Senior Member
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    For the first one all you need to know if how to expand brackets and collect like terms:

     7-5x(6-1)

     7- 30x +5x

     7 -25x

    For the second one all you need to know is how much 20% of 18500 dollars is:

     18500 * \frac{20}{100}

     = 3700

    So  18500 -3700 = 14800


    Number three is very much the same as number 2
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  3. #3
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    For the first one the correct answer is -18 (the teacher told me) but i don't understand how she got that. I got plenty of answers but never that one. And it is not x as in ex its the multiplying sign
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  4. #4
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    Sorry, you should use * instead..

    ok so...
    7-5*(6-1)

    Remember BODMAS (or BIDMAS) or whatever it is? Brackets first!

     7-5*(5)

    Multiplication before subtraction

     7-25

    Now simple subtraction

     -18

    Does that make it more clear?
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  5. #5
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    Yes thank you very much
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