Science & Mathematics - 22 September 2007

x^-4 + 8x^-2 +15 = 0

2007-09-22 05:54:57 · 6 answers · asked by Anonymous in Mathematics

2007-09-22 05:53:45 · 2 answers · asked by Kip 1 in Chemistry

2007-09-22 05:51:16 · 10 answers · asked by Anonymous in Mathematics

(Almost 99 out of 100 university student gave the wrong answer)
Jim a owner of a gift shop, buys a photo frame at a cost price of $18 and sell it at $21. A man walk in with $100 note wanting to buy the photo frame. Jim do not have small change so he went to the shop next to him to change the $100 note into small change. He then return to his shop and give the man $79 change. Later of the day the shop owner next door discover that the hundred dollars note was a counterfeit. Jim have no choice but to pay the shop owner a hundred dollars note. Question is how much money did jim lose in this transcation?

2007-09-22 05:49:11 · 10 answers · asked by laohu3gu 1 in Other - Science

2007-09-22 05:47:12 · 17 answers · asked by michael b 1 in Mathematics

agraculture and mining or mechanical

2007-09-22 05:47:00 · 4 answers · asked by Anonymous in Engineering

Northern,Eastern,Southern,orrrrrr Eastern hemisphere.
Thanks♥

2007-09-22 05:43:45 · 12 answers · asked by ♥Shorty♥ 2 in Geography

2007-09-22 05:42:36 · 13 answers · asked by Anonymous in Chemistry

PLEASE explain

im only in 8th grade

it sais that in my homework

ppl say it does, so what do i write down??!?!?

2007-09-22 05:42:02 · 9 answers · asked by Yep! 1 in Physics

1. Find h(k(x)) and k(h(x))
h(x) = 1/2(3x+5)
k(x) = (2x-5) /3x

2. The state the relationship between h and k

2007-09-22 05:40:58 · 2 answers · asked by Anonymous in Mathematics

Also what makes up electricity?

2007-09-22 05:40:19 · 2 answers · asked by Jenny G 1 in Chemistry

x / (x-2) - 2 / (x^2 +2x -8) = 5 / (x+4)

2007-09-22 05:37:06 · 5 answers · asked by Anonymous in Mathematics

this is a chemistry question

2007-09-22 05:37:01 · 2 answers · asked by Anonymous in Chemistry

If you can explain how to do these step by step that would be great
K2CrO4 + Pb(NO3)2 -------> ?
and
(NH4)2CO3 + HNO3-------> ?

Also if you can check to make sure that these are right would also be greatly appreciated

1)NaCl + AgNO3 ------> NaNO3 + AgCl
2)BaCl2+ H2SO4 -----> BaSO4 + HCl2
3)NaOH + HCl --------> NaCl + H2O
4)Na2CO3 + HCl ---->Na2Cl + HCO
5)H2SO4 + NH4OH --> H2OH + SO4NH4
6)FeCl3 + NH4OH -----> FeOH+ NH4Cl3
7)Na2SO3 + HCL ------> Na2Cl + SHO3

2007-09-22 05:33:33 · 2 answers · asked by evilshenanegans 1 in Chemistry

If air is 78% nitrogen and about 21% oxygen, with the remaining 1% a mixture of various trace gases, then what is it? Can you please explain why it is a compound or homogeneous mixture or heterogeneous mixture.

2007-09-22 05:32:50 · 5 answers · asked by fred 1 in Chemistry

Can a car get melted at that temperature?
what about other stuff like minerals (gold..)?

2007-09-22 05:31:16 · 5 answers · asked by ShaDoW 2 in Chemistry

Let see how good ya'll answer these and must show your work.

3.0(-2.57)=

-17+ x=13.3

1/2 + x=12

1/11a = 0

n/5 = 14

7/3 - x/3 = x/4

8p=5(2p+3)

2007-09-22 05:30:41 · 5 answers · asked by Mr. Vitamin C 4 in Mathematics

2007-09-22 05:29:47 · 5 answers · asked by Anonymous in Other - Science

Thanks everyone for answering my questions. I don't understand how to multiply fractions.

2007-09-22 05:27:34 · 13 answers · asked by Anonymous in Mathematics

If "a" pens cost "b" dollars, how many dollars would "c" pens cost at the same rate?

ab/c
a/bc
b/ac
bc/a
c/ab

2007-09-22 05:25:36 · 11 answers · asked by Anonymous in Mathematics

Sue and Fred have a combined age of 42 years. If Sue's age is 1/2 of Fred's, how old is Fred in years?

16
20
23
28
35

2007-09-22 05:23:34 · 6 answers · asked by Anonymous in Mathematics

2007-09-22 05:22:31 · 4 answers · asked by tons'o'fun 3 in Chemistry

what happens?

2007-09-22 05:22:23 · 3 answers · asked by Anonymous in Earth Sciences & Geology

many thanks.

NirvanaGal

xxxxxxxxxx

2007-09-22 05:19:15 · 12 answers · asked by Anne Nonny Mouse 4 in Chemistry

(1+4x+3x^2); (8x^3-1); (4x^2+2x+1); ( x^3+x^2-4x-4); (2x^2-3x-2); (4x^3-3x^2-4x+3); (4x^2+3-3); (x^2+2x-3); (6-x-x^2); (4x^2+x-3); (x^3+3x^2+3x+2); (x^3-1)

thanx

2007-09-22 05:16:53 · 3 answers · asked by Stolen 3 in Mathematics

plz help..thanks

2007-09-22 05:14:17 · 6 answers · asked by HRF2013 2 in Chemistry

2007-09-22 05:12:25 · 1 answers · asked by Stayoutofitguy 1 in Other - Science

A cable company is asked to provide service to a customer whose house is located 2 miles from the road along which the cable is buried. The nearest connection box for the cable is located 5 miles down the road. Installation cost is 2.1 cents per foot along the road and 3.5 cents per foot off the road. Describe at what point the cable installation turns off the road AND what the minimum cost for the installation will be.

2007-09-22 05:11:57 · 4 answers · asked by Hamza 1 in Mathematics

Leon drove 270 miles to the lodge in the same time Pat drove 330 to the lodge. If Pat drove 10 miles per hour faster than Leon, then how fast did each of them drive?

2007-09-22 05:11:46 · 4 answers · asked by plplz 1 in Mathematics

0. can anyone help me solve this problem; Sound travels approximately at a rate of 1.50x10(-3 subscript) meters per second through water. Determine this rate in miles per hour.

can sumone please show me step by step.

2007-09-22 05:11:05 · 2 answers · asked by Anonymous in Mathematics