Science & Mathematics - 17 November 2006

i need help understanding the terms and formulas of arithmetic progresions in general, my teacher kind of wizzed through it in class and i don't really understand. I'd like to know when to use certain formulas i'd like to see how they are written out like in words too,
for example when i heard the gauss theory and how he thought of it it really helped. Here are two example questions:

1. Find the sum of all the multiples of three between 1 and 100 and
2. Given that 5 +9+13 +17+...+Un= 2414, find n and Un

I think i found the first one ( i got 5049) but i'm really not sure, and the second one i don't know which formula to use.

2006-11-17 08:35:45 · 1 answers · asked by gg 2 in Mathematics

2006-11-17 08:35:22 · 2 answers · asked by B 1 in Physics

2006-11-17 08:34:33 · 8 answers · asked by shall822001 1 in Mathematics

When the equation is properly balanced with the smallest ratio of integer coefficients, which of the following statements are true ?


a) The coefficient of calcium cyanamide is 2

b) The coefficient of water is 3

c) The coefficient of ammonia is two thirds that of water

d) The coefficients of calcium cyanamide and calcium carbonate are both 1.


you must enter all true statements in one lower case group,
in alphabetical order
e.g., if a) b) and e) are true you would enter abe

2006-11-17 08:31:52 · 3 answers · asked by dannyg11us 1 in Chemistry

2006-11-17 08:30:32 · 5 answers · asked by Anonymous in Geography

2006-11-17 08:29:17 · 12 answers · asked by nowysaczpolska 1 in Astronomy & Space

2006-11-17 08:28:39 · 9 answers · asked by mbtafan 3 in Medicine

2006-11-17 08:28:04 · 5 answers · asked by quantum 1 in Physics

2006-11-17 08:27:52 · 27 answers · asked by ali k 1 in Mathematics

I am not sure if engineer is the right career path for me to take. I am good at solving problems but I am slow at it sometimes. Iwas good in math in school. It was the first thing they took me out of special ed for in elementry school. I was good at science in high school mainly biology. I wasnt very good in shop classes. They where really hard. I have a diploma in computer repair and graduated highest in my class but never found a job in it. I understand some concepts on how things work mechanically. I have my doubts that I could come up with pracital ideas. Alot of my ideas for things are normally usuless or just personal interest that couldnt be applied to the real world market. Also I think the fact I was in special ed in english in highschool kind of hurt my credibility and I am 25 and havent even gotten threw freshman year of college may hold me back. Personality wise I am an odd ball, eccentric sometimes, curious, and by the myers briggs type indicator an INTP.

2006-11-17 08:27:12 · 5 answers · asked by JoeDraco 4 in Engineering

2006-11-17 08:25:55 · 3 answers · asked by Anonymous in Medicine

2006-11-17 08:25:10 · 7 answers · asked by Anonymous in Engineering

Prove the identity.

cos(x - y) 1+ tan x tan y
------------ = ------------------
cos(x + y) 1- tan x tan y

here is the actual problem on the link below...thanks so much in advance for helping me.

http://www.fbixtreme.com/David/l1.jpg

2006-11-17 08:22:29 · 3 answers · asked by David N 1 in Mathematics

What do you think should be improved most in society that can be improved with technology? What is the current technonology and what are some breakthroughouts? Give details, please.
(My cousin's daughter is doing a survey for an organisation)

2006-11-17 08:21:45 · 3 answers · asked by Anonymous in Other - Science

2006-11-17 08:18:41 · 37 answers · asked by Anonymous in Weather

im thinking about becoming an electrician, but don't want to be left alone in "men's work". any tips? how much do electricians make in ohio?

2006-11-17 08:18:31 · 7 answers · asked by Anonymous in Engineering

2006-11-17 08:17:51 · 5 answers · asked by joan r 1 in Astronomy & Space

a six letter word

2006-11-17 08:15:42 · 12 answers · asked by alex b 1 in Weather

2006-11-17 08:13:20 · 5 answers · asked by booieh 1 in Zoology

2006-11-17 08:11:25 · 8 answers · asked by mrwu u 1 in Mathematics

2006-11-17 08:10:45 · 2 answers · asked by d.gilbert #80 1 in Botany

2. What are the properties of glass and plastic that make them interchangeable for
some uses? How are these materials different?

2006-11-17 08:09:17 · 1 answers · asked by bonca 2 in Chemistry

2006-11-17 08:08:44 · 2 answers · asked by ponco p 1 in Physics

2006-11-17 08:06:18 · 3 answers · asked by David k 1 in Mathematics

I have tried dissolving MgCl2.6H2O in water (100ml). Failing that, I tried dissolving the compound on a heat block...failing that (!!) i tried pH'ing whilst dissolving....nothing works! But I'm told that the solution can definately be made - but how??? Any ideas??

2006-11-17 08:05:51 · 0 answers · asked by Curious kitten! 2 in Chemistry

2006-11-17 08:05:02 · 19 answers · asked by HHH 1 in Medicine

What will you set the IV rate on the pump?

2006-11-17 08:04:18 · 1 answers · asked by izzynindie 2 in Medicine

2006-11-17 08:03:49 · 11 answers · asked by B2 2 in Astronomy & Space

i need this explained step by step, im not concerned about the answer,
a uniform rectangular sign is suspended horizontally from two cables, one attached at the left end, the other attached .250 from the right end. the mass of the sign is 3.00 kg and its length is 1.00 m. find the tension in each cable.

2006-11-17 08:01:45 · 3 answers · asked by Amanda R 2 in Physics

If I were to seak out a great white shark and they werent to come across me while I was swimming. Could I establish myself as not a food source and therefore swim in its presence without fear of an attack?

2006-11-17 08:01:01 · 16 answers · asked by Brittney G 1 in Zoology