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Math Help - needing some help again

  1. #1
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    needing some help again

    Can someone tell me if I did this right.

    Translate into a mathematical expression:

    the difference between ten and the quotient of a number and five.
    n/5-10

    is that right?

    Here is another one

    translate: the sum of fifteen and the product of twelve and x.

    15 + 12x ??????


    translate into an equation and slove.

    five less than the product of a number and two is seventeen.

    2x-5=17
    x=11

    Translate in an equation and solve:

    five more than the quotient of a number and three is eight..

    I need help with this one. I came up with x/3 + 5 = 8
    I need to sove it but have no idea what I am doing.

    I need help with them all

    Before I go, here is another...

    solve: 2x - 6(x-2) = 3(x-4)


    Thank You so much. I am not here looking for someone to give me the answers, I need help with how to do this stuff.


    Thanks
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  2. #2
    hpe
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    Quote Originally Posted by old & new
    Can someone tell me if I did this right.

    [ ... ]

    2x-5=17
    x=11
    Everything looks OK.
    Translate in an equation and solve:

    five more than the quotient of a number and three is eight..

    I need help with this one. I came up with x/3 + 5 = 8
    Correct. How did you solve 2x-5=17? You probably first added 5 to both sides, then you divided both sides by 2, since this is the factor multiplying x.

    Well, here you first subtract 5, then you multiply by the number dividing x.
    Before I go, here is another...

    solve: 2x - 6(x-2) = 3(x-4)
    Expand all the products. So 6(x-2) becomes 6x-12, therefore -6(x-2) becomes -6x+12, and 3(x-4) becomes 3x-12.
    Then collect all terms that have an x in them on one side of the equality and all the terms without on the other. This can be done by adding and/or subtracting such terms to/from both sides of the equation.
    Finally divide by the factor that multiplies x to obtain the solution.

    Post your attempt here, and I'll let you know if it's right.
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  3. #3
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    Joined
    Nov 2005
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    Needing help again

    for the problem

    solve 2x-6(x-2) = 3(x-4)
    I got an answer of 3.4

    I have no clue what I do to come up with this but I try...

    Thanks for helping
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  4. #4
    hpe
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    Quote Originally Posted by old & new
    for the problem

    solve 2x-6(x-2) = 3(x-4)
    I got an answer of 3.4

    I have no clue what I do to come up with this but I try...

    Thanks for helping
    That can't be right. The left hand side equals 6.8 - 8.4 = -1.6, while the right hand side equals 3*(-0.6) = -1.8.
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