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Math Help - I need someone to check my answers.

  1. #1
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    I need someone to check my answers.

    I need my answers checked on a few more things. All the answers are already done, so I just need someone to look over them.

    Lesson 1:
    http://img237.imageshack.us/img237/7135/pagem1mx3.jpg
    http://img237.imageshack.us/img237/8739/pagem2yq6.jpg
    Lesson 2:
    http://img237.imageshack.us/img237/1034/pagem3ds9.jpg

    Lesson 3:
    http://img237.imageshack.us/img237/3466/partf1ch1.jpg
    Lesson 4:
    http://img66.imageshack.us/img66/2074/partf2gp5.jpg

    If I got something wrong, please explain to me what I did. Thank you!
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  2. #2
    A riddle wrapped in an enigma
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    Quote Originally Posted by Rocket View Post
    I need my answers checked on a few more things. All the answers are already done, so I just need someone to look over them.

    Lesson 1:
    http://img237.imageshack.us/img237/7135/pagem1mx3.jpg


    If I got something wrong, please explain to me what I did. Thank you!
    (6)
    (2r^2)^3(3s^2)^2=8r^6\cdot9s^6=72r^6s^6

    (9)
    (3x-2)(x+4)=3x^2+10x-8

    (10)
    3x-(5x-7)=13
    3x-5x+7=13
    -2x=6
    x=-3

    (11)
    3x(4x-5)-30=4x(3x+1)+8
    12x^2-15x-30=12x^2+4x+8
    -15x-30=4x+8
    -19x=38
    x=-2
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  3. #3
    A riddle wrapped in an enigma
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    Quote Originally Posted by Rocket View Post
    I need my answers checked on a few more things. All the answers are already done, so I just need someone to look over them.

    Lesson 1:

    http://img237.imageshack.us/img237/8739/pagem2yq6.jpg


    If I got something wrong, please explain to me what I did. Thank you!
    (14)
    ii) 25(20-x)
    iii) 10x

    b) 25(20-x)+10x=490

    (15)
    i)125t
    ii)t
    iii)135t

    (16)
    x = side of square
    x+10 = length of rectangle
    x-8 = width of rectangle

    x^2=(x+10(x-8)
    x^2=x^2+2x-80
    2x=80
    x=40m^2
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