Results 1 to 4 of 4

Math Help - Trying to strengthen my math skills

  1. #1
    Newbie
    Joined
    Sep 2009
    Posts
    1

    Trying to strengthen my math skills

    I am trying to advance in my math skills and took some time to do a little algebra. I worked these problems and want to know if I got them right.

    23 = p - 4
    p - 4 -23
    p - 27

    -3x + 5 = 2
    -3x = 2 - 5
    -3x/-3x = -3/-3
    x = 1

    4 + d = 4 - 5 (d - 1) - 3
    4 + d = 4 - 5d + 5 - 3
    4 + d = -5d + 6
    4 - 6 = -5d - d
    -2 = -6d
    -2/-6 = 1/3d

    9/7 + 8/6x = -1/6x + 1
    42 (3/4 + 2/6x = -1/6x + 1)
    18 + 14x = -7x + 42
    18-42 = -7x+ 42
    -24 = -12x
    -24 * 3/-21 * 3
    x = 8/7

    x + 2/8 + x-2/12 = 3
    24 (x + 2/8 + x - 2/12 = 3) = 3 8 24/72
    3x + 6 + 2x - 4 = 72
    3x + 2x = 72 - 6 + 4
    5x/5 70/5 = 14
    x = 14


    the perimeter of a triangle is 144. What are the consecutive even integers for each side?
    x + x + 2 + x + 4 = 144
    3x + 6 = 144
    144 - 6 = 138
    3x/3 138/3 = 46
    46...48...50 are the consecutive even integers

    5z - 12 >= 6z - 8 >= 4
    5z - 6z >= 12 - 8 >= 4
    -1z >= 4 >= 4
    cannot be solved

    5 (4 - 3x) < 7 (3 - 4x) + 12
    20 - 15x < 21 - 28x + 12
    20 - 12 - 12 < 28x - 15x
    -13 < -13x
    < 1

    8x - 23/6 + 1/3 >= 5/2x
    I couldn't figure this one out but I tried it.
    2 * 8x - 23 + 4 >= 6 * 5
    16x - 23 >= 4 >= 30

    I think I got all of those right.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member Matt Westwood's Avatar
    Joined
    Jul 2008
    From
    Reading, UK
    Posts
    785
    Thanks
    17
    23 = p - 4
    p - 4 -23
    p - 27

    No, you got your equals and minus signs in a mess.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Super Member Matt Westwood's Avatar
    Joined
    Jul 2008
    From
    Reading, UK
    Posts
    785
    Thanks
    17
    -3x + 5 = 2
    -3x = 2 - 5
    -3x/-3x = -3/-3
    x = 1

    No, in the 3rd line you've got one x too many.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Super Member Matt Westwood's Avatar
    Joined
    Jul 2008
    From
    Reading, UK
    Posts
    785
    Thanks
    17
    4 + d = 4 - 5 (d - 1) - 3
    4 + d = 4 - 5d + 5 - 3
    4 + d = -5d + 6
    4 - 6 = -5d - d
    -2 = -6d
    -2/-6 = 1/3d

    Your last line you went wrong - I think you meant:

    -2/-6 = -6d/-6
    1/3 = d

    In general, you know what you're doing - you need to be a *little* more careful when writing stuff down because the teacher will come down on little things like this.


    The others also all seem to need attention - I'm trying to figure out your thinking when you did:

    9/7 + 8/6x = -1/6x + 1
    42 (3/4 + 2/6x = -1/6x + 1)

    ... because it doesn't look right to me. Unless there's something I'm missing.


    Good job, though - exercises really do help.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. How to improve math skills?
    Posted in the Math Topics Forum
    Replies: 4
    Last Post: September 27th 2010, 01:53 PM
  2. Sharpening my math skills (please help)
    Posted in the Algebra Forum
    Replies: 5
    Last Post: September 15th 2010, 07:14 PM
  3. Should I major in Comp Sci w/ low math skills?
    Posted in the Calculus Forum
    Replies: 4
    Last Post: February 18th 2010, 10:07 AM
  4. [SOLVED] need to brush up on math skills
    Posted in the Algebra Forum
    Replies: 3
    Last Post: December 16th 2008, 05:19 PM
  5. Simple program for quizing basic math skills
    Posted in the Math Software Forum
    Replies: 0
    Last Post: July 25th 2008, 09:52 PM

Search Tags


/mathhelpforum @mathhelpforum