Science & Mathematics - 22 August 2007

2007-08-22 21:09:13 · 5 answers · asked by Dll E 1 in Weather

in an effort to better understand how calculus works (instead of just solving problems), i have a maybe simple-maybe difficult question to ask regarding u substitution.

In integration, when you set something equal to u, why must you take du/dx. How exactly does that work? To make my Q clearer, here is an example.

definite integral of [(3x^2 + 2x)/(x^3 + x^2)]dx

u = x^3 + x^2
du = (3x^2 + 2x) dx <-----------what exactly is going on here??

integral du/u is ln|u| so answer is ln|x^3 + x^2|...

Sorry if this question sucked, but I really would like to know more in depth...

2007-08-22 20:50:25 · 6 answers · asked by LIFE HATER 1 in Mathematics

2007-08-22 20:46:36 · 7 answers · asked by Piper_010 1 in Agriculture

2007-08-22 20:34:59 · 11 answers · asked by Anonymous in Astronomy & Space

explain using writing

2007-08-22 20:34:41 · 8 answers · asked by azncutie45 2 in Mathematics

2007-08-22 20:29:33 · 7 answers · asked by xxbabycheekzix 1 in Mathematics

2007-08-22 20:27:00 · 7 answers · asked by jennifer f 1 in Mathematics

What are the values for x for which (x-2)(x+5) >0 ?

2007-08-22 20:21:53 · 7 answers · asked by huskychick88 1 in Mathematics

2007-08-22 20:14:17 · 19 answers · asked by Pinky - 1 in Biology

2007-08-22 20:11:35 · 9 answers · asked by akki 1 in Geography

2007-08-22 20:04:30 · 6 answers · asked by Anonymous in Engineering

2007-08-22 20:00:49 · 6 answers · asked by xxbabycheekzix 1 in Mathematics

I recently saw an inquisitive show called "South Park" and I am concerned about the possibilty of Manbearpig invading my town. What types of percautions do I take to protect my family? I am totally cereal.

2007-08-22 20:00:28 · 5 answers · asked by mysticeyezzz 4 in Zoology

(I know, I do not believe they ARE here) but...................
why would they show up,
mostly in the US, (but still reported world wide)

considering they need advanced intelligence and power to travel light years to arrive at earth.

why wouldn't they don't interact with the general public ( besides one on one )

and how could military power overcome such technology and keep it hidden so successfully, with out them over powering us?

2007-08-22 19:53:36 · 5 answers · asked by Mercury 2010 7 in Astronomy & Space

and vice versa?

2007-08-22 19:51:15 · 3 answers · asked by heckyealevel1foreverlol 2 in Weather

if deltaG<0 for a reaction at all temps the what is delta S and delta H? i.e positive, negative or zero?

2007-08-22 19:43:10 · 4 answers · asked by Anonymous in Chemistry

2007-08-22 19:40:32 · 5 answers · asked by jen b 1 in Mathematics

2007-08-22 19:33:04 · 8 answers · asked by Margaret D 2 in Zoology

An insurance company records on 1,000 insurance policy holders reveals the following information:

1) 220 purchased only disability insurance.

2) 110 purchased health and life insurance.

3) 330 purchased health insurance.

4) 100 purchased only life insurance.

5) 100 purchased disability and life insurance.

6) 470 purchased only disability, only health, or only life insurance.

7) 330 did not purchase disability, health, or life insurance.

Calculate the number of these policy holders that purchased life and health insurance but did not purchase disability insurance.

2007-08-22 19:24:58 · 1 answers · asked by austin 1 in Mathematics

Solve for X:

1) log(x) + log(x-3) = 1

2) e^(3k) = 5

3) ln(y) = 2t - 3


I thought I had a handle on this log stuff, but i guess not or are these problems just really complex??

2007-08-22 19:21:25 · 4 answers · asked by GHAAD 4 in Mathematics

Describe each of them and explain the types of situations or conditions ewach one is best suited to.

2007-08-22 19:18:22 · 4 answers · asked by miracle123jane 1 in Astronomy & Space

But to my greatest surprise in the course of our discursion he said he never attained and completed from a four year college.

Question: Is the any thing as Aviation Enginnering other that Aerospace Engineer which I know my school offers as a four year degree. I am EE major

2007-08-22 19:16:06 · 3 answers · asked by fun_easyintelligent 2 in Engineering

if winter in the northern is it spring or summer in the southern?

2007-08-22 19:13:06 · 15 answers · asked by Anonymous in Earth Sciences & Geology

2007-08-22 19:12:54 · 8 answers · asked by kt 1 in Zoology

2007-08-22 19:09:29 · 18 answers · asked by miracle123jane 1 in Astronomy & Space

i want to input mass and speed as variables

2007-08-22 19:09:28 · 6 answers · asked by besharali_315 1 in Physics

ive seen a couple spiders in my house that are bigger then ive seen and they are brown and scary as heck. just wanna know if they are the brown recluse

2007-08-22 19:08:43 · 8 answers · asked by Anonymous in Zoology

the steps would be helpful!

2007-08-22 19:07:41 · 5 answers · asked by nope 1 in Chemistry

27^(2x) = 9^(x-3)

I do not know how to solve for x with these types of exponets, so any help with be much appreciated.

2007-08-22 19:05:49 · 9 answers · asked by GHAAD 4 in Mathematics

could u suggest the problem in coorosion of metals or alloys or corrosion inhibition using organic compounds so that i can do my Ph.D

2007-08-22 19:04:21 · 1 answers · asked by komalsingh 2 in Chemistry