I need someone to check my answers.

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July 30th 2008, 12:51 AM
Rocket

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!
July 30th 2008, 05:12 AM
masters

Quote:

Originally Posted by Rocket

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)
$3x(4x-5)-30=4x(3x+1)+8$
$12x^2-15x-30=12x^2+4x+8$
$-15x-30=4x+8$
$-19x=38$
$x=-2$
July 30th 2008, 05:34 AM
masters

Quote:

Originally Posted by Rocket

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

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