Science & Mathematics - 3 December 2006

why?

2006-12-03 05:31:24 · 18 answers · asked by Shirley V 2 in Mathematics

This is science?
Determin the identy of the following element described below.

1.This metal is very reactive, has properties similar to magnesium, and is in the same period as bromine.

2.This shows the percentages of elements in the earth's crust.
46.6% O
27.7% Si
8.1% Al
5.0% Fe
3.6% Ca
2.8% Na
2.6% K
2.0% Mg
1.6% Other

Excluding the"other" category, what percentage of the earth's crust is
a.alkali metals?
b.alkaline earth metals?

2006-12-03 05:31:04 · 3 answers · asked by rbd fan 1 in Chemistry

a) 2-methyl-1-butene
b) 2 methylbutanone
c) 2-pentanone
d) 2-methylbutanal
e) no reaction

How are you suppost to figure this out? I am lost! I guess dehydration is a loss of a H???? explain please!

2006-12-03 05:30:46 · 2 answers · asked by Karen 1 in Chemistry

If a coin is tossed 4 times, what is the probability of getting 4 tails?


A. 1/2

B. 1/4

C. 1/6

D. 1/8

E. 1/16

2006-12-03 05:30:14 · 10 answers · asked by Anonymous in Biology

A: w(x) = x^4 + x^2 - 1 is an even function.

B: k(x) = (ln x)^2 is an even function.

a. Only A is true.
b. Only B is true.
c. Both A and B are true.
d. Both A and B are false.

2006-12-03 05:30:00 · 3 answers · asked by Doug 2 in Mathematics

possible solutions...

a. 1.44
b. 1.48
c. 1.52
d. 1.55
e. 1.60
f. none of these

2006-12-03 05:28:49 · 2 answers · asked by Olivia 4 in Mathematics

okay, say i purchased a pair of head skis for a sale price of $231. how would i find out the original price if it had been marked down 20%?

2006-12-03 05:28:18 · 6 answers · asked by johnny d 2 in Mathematics

A frog has to keep its mouth closed in order to breathe with its lungs.

2006-12-03 05:26:28 · 2 answers · asked by chris76ers1 3 in Zoology

2006-12-03 05:26:18 · 13 answers · asked by i_need_a_username99 1 in Mathematics

2006-12-03 05:26:15 · 7 answers · asked by shan_997 2 in Physics

As a projectile moves in its path, is there any point along the path where the velocity and acceleration vectors are parallel to each other?

I suck at this physics stuff.... I know the perpendicular to each other is THE HIGHEST POINT. But... I can't put two and two together. Hoping someone knows this stuff better than me. Would it be the lowest point or when it is the same? or?? lol

2006-12-03 05:25:58 · 5 answers · asked by ymcabookwormcat 3 in Physics

Ok here we go.....
I bought a potted living spruce tree for a outside Christmas tree.
However i have discovered it has very little roots, and this is not being helped by the high winds which are disturbing the roots and making it blow over and out of the pot!
So i have tied it up from all sides in the hope that will support it.
Any tips on how to keep it alive and how to encourage more root growth?

2006-12-03 05:25:16 · 14 answers · asked by Scarlet 2 in Botany

If "a" is 50% larger than "c" and "b" is 25% larger than "c", then "a" is what percent larger than "b"?

2006-12-03 05:23:56 · 5 answers · asked by Sasha 2 in Mathematics

possible solutions

a. pi/6
b. 8pi/3
c. 27pi/2
d. 128pi/3
e. 625pi/6
f. 216pi
g. none of these

2006-12-03 05:23:49 · 1 answers · asked by Olivia 4 in Mathematics

1)Cu + HNO3---> Cu(NO3)2 + NO2 + H2O
2)Cu2S + O2---> Cu2O + SO2
3)Li + H2O---> LiOH + H2
4)CL2 + NaBr---> NaCL + Br2
5)Cu + H2SO4---> CuSO4 + SO2 + H2O
6)C + H2O---> CO + H2
7)K + H2O---> KOH + H2
8)CH4 + O2---> CO2 + H2O
9)Fe + AgC2H3O2---> Fe(C2H3O2)2 + Ag
10)Al + CuCL2---> ALCL3 + Cu
11)Fe2O3 + CO---> Fe + CO2

2006-12-03 05:22:41 · 4 answers · asked by Anonymous in Chemistry

does anyone get this problem??


A rock club's profit from booking local bands depends on the ticket price. Using past receipts, the owners find that the profit "p" can be modeled by the following function where "t" represents the ticket price in dollars.

so this is function i have: p = -15t(squared) + 600t + 50



what would the vertex be??

2006-12-03 05:22:38 · 4 answers · asked by Anonymous in Mathematics

2006-12-03 05:22:30 · 1 answers · asked by chris76ers1 3 in Zoology

2006-12-03 05:22:30 · 11 answers · asked by Scarface999 2 in Astronomy & Space

2006-12-03 05:22:13 · 11 answers · asked by Anonymous in Geography

2006-12-03 05:21:00 · 3 answers · asked by miffed 1 in Earth Sciences & Geology

2006-12-03 05:20:50 · 1 answers · asked by chris76ers1 3 in Zoology

Possible solutions...
a. 16pi/15
b. 512pi/15
c. 1296pi/5
d. 16384pi/15
e. none of these

2006-12-03 05:20:11 · 1 answers · asked by chris 2 in Mathematics

so that the resulting stream of water approximates a sine curve

2006-12-03 05:19:11 · 1 answers · asked by justin c 1 in Physics

what is the frequecy of the minute hand and the hour hand

2006-12-03 05:14:49 · 3 answers · asked by justin c 1 in Physics

possible solutions

a. (1/2) + (1/2)cos 2x + C
b. (1/2) - (1/2)cos 2x + C
c. x/2 - (1/4)sin 2x + C
d. x/2 + (1/4)sin 2x + C
e. tan x + C
f. - cot x + C
g. none of these

2006-12-03 05:14:22 · 1 answers · asked by Olivia 4 in Mathematics

2006-12-03 05:14:16 · 9 answers · asked by Anonymous in Physics

The Big Brick Bakery sells more bagels when it reduces its prices, but then its profit changes. The function y = -1000 (x - 0.55) squared + 300 models the bakery's daily profit in dollars from selling bagels, where x is the price of a bagel in dollars. The bakery wants to maximize the profit.


oooyee .. now my question is what is the domain fo the function?? && also can x be negative in this problem?? ..confusion >_<

2006-12-03 05:12:32 · 5 answers · asked by xolifes2sh0rtox 1 in Mathematics

If i understand right, a tertiary alcohol does not usually undergo oxidation. so....please help!

2006-12-03 05:12:02 · 3 answers · asked by *AH AH* 1 in Chemistry

course of Xifaxan 2x a day, for bacterial overgrowth which recent studies are indicating might be the culprit of irritable bowel syndrome. This drug is given for 3 days for Travelers diarreah, however its prescribed for 10 days for the bacterial overgrowth.

My question is which of the following 2 other antibiotics would complement this antibiotic course better Metronidazol 500 mg or Ciproflaxin, these two are used to treat ameobas and parasites. I was given one back in Arpil when I got food poisoning in Mexico, and the other when I got a real bad case of diarreah in Mexico in July, while vacationing.

Please only people with experience, since I am attacking the bacteria, I feel it would be a good idea to attack any posibble remnants of ameobas or parasites, and just to be safer. I have heard that sometimes you could develop c.difficile after taking xifaxan and one of the other 2 might prevent this, also they have been given in conjuction before.

2006-12-03 05:10:13 · 3 answers · asked by Anonymous in Medicine

Let f(x) = e^x - e^-x and g(x) = e^x + e^-x . Also, let h(x) = f(x)/g(x).

Then
lim h(x) =
x=>0

2006-12-03 05:09:52 · 3 answers · asked by Olivia 4 in Mathematics