Science & Mathematics - 28 January 2007

1/f = 1/f1 + 1/f2 + 1/f3

solve for f1

I just need some help setting it up.

2007-01-28 13:57:44 · 1 answers · asked by wow i need help 1 in Mathematics

2007-01-28 13:56:35 · 3 answers · asked by ☆Stranger in a Sunset☆ 3 in Weather

Find the value of the polynomail -x^2+10x-10, when x= -5

just to let you know that I am trying I have got
-(-5^2)+10x-10=
-(25)+(-50)-10=
25+50-10
25+50=75-10=65

I know that somewhere I am messing up can somone help me find where I am making the mistake.

the other problem that I am struggling on is
the poduct of two consecutive positive intergers is 288. Find the intergers.

so far I ahve got
x(x+2)=288
x^2+2x-288=0
this is where I get lost.

please help me!!
Thanks

2007-01-28 13:54:26 · 7 answers · asked by Anonymous in Mathematics

what is the difference between light and laser?

2007-01-28 13:53:39 · 5 answers · asked by Amy 2 in Physics

2007-01-28 13:51:40 · 3 answers · asked by LGuard332 2 in Mathematics

A doctor assumes that a patient has one of three disease a1,a2, or a3. Before any test, he assumes an equal probability for each disease. He carries out a test that will be positive with probability 0.8 if the patient has a1, 0.6 if he has disease a2, and 0.4 if he has disease a3. Given that the outcome of the test was positive, what probabilities should the doctor now assign to the three possible diseases?

2007-01-28 13:51:07 · 3 answers · asked by Lotus 2 in Mathematics

how would you knowing your entire genetic background, hurt or help you?

2007-01-28 13:51:01 · 7 answers · asked by Anonymous in Biology

using y=ab^x and y=ax^b take the natural logarithm of each side of each equation. What are the slope and y-intercept of the line relating x and ln y for y=ab^x? What are the slope and y-intercept of the line relating ln x and ln y for y=ax^b?

2007-01-28 13:50:13 · 3 answers · asked by confused 2 in Mathematics

-12y^2+y+6

2007-01-28 13:49:55 · 2 answers · asked by jallen7865 1 in Mathematics

My doctor refused to do an iron test because he said my hemoglobin was fine, (he also missed a later confirmed case of multiple sclerosis which an mri caught after i complained so much) so i really wonder if he knows what he's talking about.

2007-01-28 13:49:42 · 4 answers · asked by Kirk 2 in Medicine

5(-7+n)-(3n-7)=-(-3+n)-5n+9

for the solution set i got 6.66
can anyone just make sure

2007-01-28 13:49:14 · 4 answers · asked by Anonymous in Mathematics

I have to do this report on Zipf's Law, and one of the graphs I came up with had a line of best fit with a power equation or power model.
It gave me this equation when i figured it from microsoft excel: y = 8E+06x^(-1.0687)


I have to plug in 11 for x, but i don't know how to solve it. what is E?

2007-01-28 13:47:19 · 3 answers · asked by Lexis 2 in Mathematics

hello, i hope u can understand the question. i have a synthesis problem over here, where i got a hydrazone product. It is given that it is solid. but i have to give 2 reasons why the product was solid and not liquid...i know it has to do something with mp or bp..but i dont know what to write????

2007-01-28 13:47:13 · 1 answers · asked by knp_1984 2 in Engineering

what is a sundog and can a sundog tell the weather or feature weather

2007-01-28 13:46:12 · 1 answers · asked by Anonymous in Weather

I am doing a presention on familial retinoblastoma and I can't seem to figure out why it effects the eye first. It's a gene that is present in every one of our cells but upon mutation/deletion, the tumor first shows up in the eye. I've gone through quite a few research articles & websites but I am still missing that big of info. Any help would be greatly appreciated.

2007-01-28 13:45:59 · 4 answers · asked by modawg2k 2 in Biology

2007-01-28 13:45:51 · 2 answers · asked by KEVIN C 1 in Earth Sciences & Geology

The profit on a watch is given by P=x^2-13x-80, where x is the number of watches sold per day. how many watches were sold on a day when there was a $50 loss?

2007-01-28 13:43:54 · 7 answers · asked by savannah_banana03 1 in Mathematics

Prove that the intersection of two subspaces of a real vector space is a real vector space.

2007-01-28 13:43:35 · 1 answers · asked by AARON F 1 in Mathematics

2007-01-28 13:42:34 · 2 answers · asked by savannah_banana03 1 in Mathematics

find an equation for the set of all points (x,y) satisfying the given conditions.

2007-01-28 13:42:31 · 1 answers · asked by Linda L 1 in Geography

How do Amino acids bond??? is it a peptide bond?

2007-01-28 13:42:20 · 4 answers · asked by UNCBballGirl 2 in Biology

what is the limit as x-->3 for (2x^2/x-3)-(6x/x-3)...this can also be simplified as what is the limit as x-->3 for (2x^2-6x)/(x-3)?

what is the limit as x--> infinity for (2x^3-3x^2+5x-1)/(4x^3+2x^2-x+10)?....please show work for both answers...thanks a bunch!

2007-01-28 13:41:46 · 3 answers · asked by nyadastar 2 in Mathematics

I know you have to factor out the y but is there something after that?

2007-01-28 13:41:29 · 7 answers · asked by savannah_banana03 1 in Mathematics

2007-01-28 13:41:20 · 4 answers · asked by momoftwins1986 1 in Mathematics

If a wild bobcat, lynx, or mountain lion would drink milk would they want to attack a lactating cow and want more?

2007-01-28 13:41:04 · 5 answers · asked by Anonymous in Zoology

2007-01-28 13:40:15 · 3 answers · asked by Anonymous in Biology

2007-01-28 13:39:05 · 3 answers · asked by Bill G 1 in Astronomy & Space

2007-01-28 13:38:52 · 10 answers · asked by savannah_banana03 1 in Mathematics

2007-01-28 13:38:52 · 8 answers · asked by MW 3 in Zoology

The three-toed sloth is the slowest moving land mammal. On the ground, the sloth moves at an average speed of 0.048 m/s, considerably slower than the giant tortoise, which walks at 0.083 m/s. After 12 minutes of walking, how much further would the tortoise have gone relative to the sloth?

2007-01-28 13:36:04 · 2 answers · asked by mariah3785 1 in Physics