Questions on Algebra: Polynomials, rational expressions and equations answered by real tutors!

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Question 7160: Here's my question.
Solve:
(8 x 10^99) + (3 x 10^99)
I got:
24 x 10^198
Is this correct??????? Thanks so much for your help.

Click here to see answer by glabow(165)

Question 7141: Write answers in scientific notation. Round to three decimal places
(8.79 × 108) + (6.48 × 109)
Click here to see answer by glabow(165)

Question 7179: What is the real-world application for multiplying and factoring polynomials? For example, why does one need to know how to multiply (x-2)(x+5)? If I were to write a word problem using these polynomials, what could it be? Or, could I not write one, since an equation is not being solved? What answer do I give a student who says, "Why do I need to know this?" Thank you.
Click here to see answer by prince_abubu(198)

Question 7201: will you please help me factor this equation: 16k squared minus 80k plus 100. thankyou
Click here to see answer by Earlsdon(4898)

Question 7200: will you please help me factor this equation: 2x squared plus 8x plus 6. thankyou
Click here to see answer by khwang(438)

Question 7199: will you please help me simplify this expression: y squared over 12x
Click here to see answer by khwang(438)

Question 7215: i don't know where to start with this problem.
4/x-3 + 1/3-x
any suggestions?
Click here to see answer by longjonsilver(2297)

Question 7233: Hi, I am not sure where to start with this problem. Simplify 5x^2y-2x^2y(2+y)+8x^2y^2...... Thanks so much for any help... I'm just not sure where to start.... the part with the parentheses throws me off....
Thanks,
Ashley
Click here to see answer by ichudov(404)

Question 7301: solve each proportion.
2/7 = x/-42
5/12 = (x+1)/4
(n+8)/-5=(n-3)/-1
(5-w)/(3+w)=13/12
any idea on these?
im absolutely clueless...
Click here to see answer by bonster(299)

Question 7271: Simplify
Click here to see answer by bonster(299)

Question 5594: Is -0.685 a rational or irrational number?
I'm pretty sure that it's a rational number.
Thanks!
Click here to see answer by prince_abubu(198)

Question 7446: I would REALLY appreciate it if a tutor could assist me with the following problem:
Find all the asymptotes of f(x) =
I believe there is an oblique and possibly a vertical asymptote.
Thanks so much!!!
Click here to see answer by prince_abubu(198)

Question 7679: i'm having trouble with this problem.-3 1/4 x 2 1/2.i know it's simple ,but i don't know what to do with the whole numbers in the mixed fraction.i got -6 1/8.
when i checked it on my calculater it said -8 1/8.i don't understand how they got that.please respond a.s.a.p.
thanks,
angel13
Click here to see answer by prince_abubu(198)

Question 7765: help!!!!!!!!!
how can you factor
3x-12x^3???
any help would be appreciated
thanks
Click here to see answer by Earlsdon(4898)

Question 7768: Perform the indicated operation.

6x - 18/2x^2 - 5x - 3 * 4x^2 + 4x +1/ 6x + 3

This is how I started:

I took the 6x - 18 and changed it to 6x - 3. So the 6x - 3 and the 6x + 3 should cancel each other out right?

Then I'm stuck after that because I can't figure out what to do with the other two polynomials.I have 2x^2 - 5x - 3. I think you have to find the sum of two numbers that equal 5 and -3, but I have no clue.

Maybe you can't reduce this any further than :

4x^2 + 4x +1/2x^2 - 5x -3

so that would make it prime. Could that be the answer? Please HELP! Thanks in advance to all who answer.
Click here to see answer by Earlsdon(4898)

Question 7777: Need this checked:
(3abc^2/7a^2b)^4
My answer ended up being: 81a^3c^16/2401
It's been a while since I've done algebra could you check my work and let me know, thanks.
Click here to see answer by Earlsdon(4898)

Question 7851: Factor the polynomial

h^2 - 9hs + 9s^2

I don't think this can be factored, because I can't figure out a product of 9 and a sum of -9

Please let me know if I am correct. Thanks in advance.
Click here to see answer by Earlsdon(4898)

Question 7855: Factor completely

12a^2 + 36a +27

this is what I have:

3(4a^2 + 12a + 9)
Is this my answer? thanks in advance for your help.
Click here to see answer by Earlsdon(4898)

Question 7860: Please help me with this mixture problem. I have no idea how to do it. THanks
A car radiator contains 10 liters of a 30% antifreeze solution. how many liters will have to be replaced with pure antifreeze if the resulting solution is to be 50% antifreeze?
Click here to see answer by Earlsdon(4898)

Question 7899: find the LCD for the given rational expressions, and convert each rational expression into an equilalent rational expression with the LCD as the denominator.

5/12a^6b, 3b/14a^3, 1/2ab^3

HELP!!!!!!!!!!!!!!!!! thanks to all who reply.

Click here to see answer by Earlsdon(4898)

Question 7943: perform the indicated operation

5/3a - 9 - 3/2a + 4/a^2 -3a

Is this where you find the LCD and then go from there?
3= 3
9 = 3^3
2= 2
largest ones = 3^3 * 3 * 2 = 54a^2

Book answer is: a + 51/ 6a(a-3)
Pleae help. Thanks to all
Click here to see answer by longjonsilver(2297)

Question 7189: 3y
_ -6x Is this a monomial, binomial or trinomial?
2x

Click here to see answer by CharStar(110)

Question 8099: I am having a problem with "special cases of factoring".
x^2-100
I think that it is, (x+100)(x-100)
Click here to see answer by prince_abubu(198)

Question 8148: How do I simplify this problem
3a + b/6a + 2b
Click here to see answer by longjonsilver(2297)

Question 8179: Simplify.... (x^3-8) / (x-2)

Comment---> no idea where to start!
Thank you
Click here to see answer by longjonsilver(2297)

Question 8205: How do I simplify this problem:
(x^2 - y^2) / (x + y)
Click here to see answer by Earlsdon(4898)

Question 8209: How do I simplify this problem?

(a^2 - 2ab +b^2) / (a - b)
Click here to see answer by Earlsdon(4898)

Question 8212: How do I simplify this problem?
(2x^2 + x - 6) / (2x + 4)
Click here to see answer by Earlsdon(4898)

Question 8215: 15p+p=7-12p
Click here to see answer by bonster(299)

Question 8211: How do I simplify this problem?
a^2 - 2ab + b^2 / a + b
Click here to see answer by glabow(165)

Question 8310: How do I solve this problem?
b / b - 1 + 2b / b^2 - 1
Click here to see answer by bonster(299)

Question 8315: Find the LCD.....
3/a , 3/b , 1/5
Click here to see answer by bonster(299)

Question 8309: ( ) ÷ ()
Click here to see answer by bonster(299)

Question 8314: How do I simplify this problem by dividing it?

Click here to see answer by bonster(299)

Question 8312: Hoe do I solve this problem?
4 / a - 5 - 1 / 5 - a
Click here to see answer by longjonsilver(2297)

Question 8369: need to know if my answer to this polynomial iscorrect. (3m squared - 2m + 4)(m squared - 3m - 5 ) my answer is 3m to the fourth power - 11m cubed - 5m squared -2m-20
Click here to see answer by Earlsdon(4898)

Question 8424: I am having difficulty factoring trinomials, could you please help me with this problem?

Click here to see answer by srinivas123(23)

Question 8477: (3/(X^2-9))is equal to (6/(X+3))
Click here to see answer by arunpaul(104)

Question 8437: How do I do this problem?

Click here to see answer by bonster(299)

Question 8519: I'm having problems solving equations with fractional coefficients.
2.4x - 1.2x = 4.8
Click here to see answer by prince_abubu(198)

Question 8529: I can't simplify this problem
x^-2 y^3
Click here to see answer by glabow(165)

Question 8526: How do I simplify this problem?
(a^2 b^0 c)^0
Click here to see answer by glabow(165)

Question 8530: 3x^-2
Click here to see answer by rapaljer(3620)

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