# Thread: Basic algebra

1. ## I Need Help Asap - My Homework Is Due By 12:00am!

I am having major difficulties with my Alegebra, if anybody can help please hurry it's due soon! Here are my problems :

1. A triangle has three sides 3x+7, 4x-9 and 5x-6. Find the expression that represents its perimeter.

2. The quotient when 3 more than a number is divided by 3 less than that same number.

3. 6x^2y^3+9x^2y^3
3x^2y^2

I am very confused and I have to be at work in a few hours so I need HELP ASAP!

2. Originally Posted by foofergutierrez
I am having major difficulties with my Alegebra, if anybody can help please hurry it's due soon! Here are my problems :

1. A triangle has three sides 3x+7, 4x-9 and 5x-6. Find the expression that represents its perimeter.
$(3x+7)+(4x-9)+(5x-6)=12x-8$

3. Originally Posted by foofergutierrez

2. The quotient when 3 more than a number is divided by 3 less than that same number.
Let $x$ be the number, then we are told that:

$\frac{x+3}{x-3}$

RonL

4. ## Thanks

I thought I was doing it wrong but it was right! Thanks for your help!

5. Originally Posted by foofergutierrez
I am having major difficulties with my Alegebra, if anybody can help please hurry it's due soon! Here are my problems :

1. A triangle has three sides 3x+7, 4x-9 and 5x-6. Find the expression that represents its perimeter.
the perimeter is all the sides added together so:

$side_1+side_2+side_3$

substitute: $3x+7+4x-9+5x-6$

group like terms: $3x+4x+5x+7-9-6$

add/subtract: $12x-8$

2. The quotient when 3 more than a number is divided by 3 less than that same number.
3 more than a number, ( $n+3$) is divided by 3 less than a number, ( $n-3$)

write it out: $\frac{n+3}{n-3}$

and that number can't be simplified

3. $\frac{6y^3x^2+9y^3x^2}{3y^2x^2}$
add: $\frac{(6+9)y^3x^2}{3y^2x^2}$

add: $\frac{15y^3x^2}{3y^2x^2}$

seperate the fractions: $\frac{15}{3}\times\frac{y^3}{y^2}\times\frac{x^2}{ x^2}$

write it out: $\frac{3\times5}{3}\times\frac{yyy}{yy}\times\frac{ xx}{xx}$

divide: $\frac{\not3\times5}{\not3}\times\frac{\not y\!\!\!\not yy}{\not y\!\!\!\not y}\times\frac{\not x\!\!\!\not x}{\not x\!\!\!\not x}$

write it out: $5\times y=5y$

voila

 I can't believe you guys, answering the questions quicker than me! (except for Cap'n's answer for #3, he's a bit late[/edit]

6. Originally Posted by foofergutierrez
:
3. 6x^2y^3+9x^2y^3
3x^2y^2
Add the terms in the denominator to get:

$\frac{6x^2y^3+9x^2y^3}{3x^2y^2 }=\frac{15x^2y^3}{3x^2y^2 }$,

then cancel so:

$\frac{6x^2y^3+9x^2y^3}{3x^2y^2 }=5y$.

RonL

7. ## You are my heros!

Thank you all sooo much! I 'm sure that I will be on here again soon and I am sooo grateful for your brains. Thanks again and I'll be back soon!

8. Originally Posted by foofergutierrez
Thank you all sooo much! I 'm sure that I will be on here again soon and I am sooo grateful for your brains. Thanks again and I'll be back soon!
Oh-Noooo... zombies

RonL

9. Originally Posted by CaptainBlack
Oh-Noooo... zombies

RonL
Oh good Lord! (Shakes his head in despair, wishing he had thought of it first.)

-Dan

10. You know what I'm wondering? What kind of teacher has something due at midnight...

11. Originally Posted by Quick
You know what I'm wondering? What kind of teacher has something due at midnight...
You know, I made that mistake once and showed up for a Ceramics lab 12 hours late...

-Dan