Mathematics - 29 October 2007

how do you do the u-substitution for this..i mean like what is u? du? dv? v? how could u figure out which is which?
i thought
u= x dv= lnxdx
du= xdx v= 1/x

2007-10-29 17:28:32 · 5 answers · asked by tc 1

oh my JAH!
im really doomed with this subject..what is the key?

2007-10-29 17:22:45 · 7 answers · asked by Anonymous

Isn't algebra a little out dated? We now have computers that can graph and find all of the algebraic problems we need solved, like profit analysis for buisnesses. I am by no means saying abolish all algebra from schools, but merely to compact the course down to the absolute basics and necessities that will actually be used in most people's day to day life and careers and incorporate it into another mathematical course. I believe that to have multiple years of algebra be mandatory is a waste of government money. Shouldn't extensive study in this course only be optional for students going into a field of work that is algabraically heavy? What do you think?

2007-10-29 17:10:42 · 8 answers · asked by nsteedazx3 1

You plan to earn $15 per week for a charity. Will you use estimation, mental math, paper and pencil, or a calculator to determine, how many weeks it will take you earn $1,000? Explain why.
(2) The monthly rate for a 3 year subscription to an online music service is $10. What is the total cost for 3 years?

2007-10-29 17:02:42 · 1 answers · asked by rosemariestewart64 1

A city of 250,000 people is growing at a rate of 1.3% per year. Estimate the population of the city 30 years from now.

1. S(31) = 250,000(1.3)^(31-1)
2. S(30) = 250,000(1.3)^(30-1)

Which set-up is correct?

2007-10-29 17:01:38 · 1 answers · asked by James 1

A rocket is fired at a speed of 75.0 m/s from ground level, at an angle of 64.3° above the horizontal. The rocket is fired toward an 11.0 m high wall, which is located 30.5 m away. By how much does the rocket clear the top of the wall?

2007-10-29 16:54:02 · 1 answers · asked by Anonymous

2007-10-29 16:50:49 · 1 answers · asked by Anonymous

A solution of 51% pesticide is to be mixed with a solution of 35% pesticide to form 144 liters of a 42% solution. How many liters of the 51% solution must be used?

[a] 63 liters
[b] 73 liters
[c] 120 liters
[d] 119 liters


please show me how to do it
thanks :)

2007-10-29 16:49:47 · 4 answers · asked by vennysweetgirl21 3

2007-10-29 16:48:29 · 6 answers · asked by Anonymous

Write 3/7-i as a complex number in standard form

2007-10-29 16:43:58 · 3 answers · asked by Anonymous

The amount A in an account after t years from an initial principle P invested at an annual rate r compounded continuously is given by A = Pe^rt where r is expressed as a decimal. Solve this formula for t in terms of A, P, and r.
a. t = ln(AP/r)
b. t = ln(A/rP)
c. t =r ln(A/P)
d. t=1/r ln(A/P)

2007-10-29 16:36:42 · 2 answers · asked by tessa 1

Solve the equation ln(x + 5) - ln(3) = ln(x - 3).
a. 2.5
b. 5
c. 7
d. 4.5

2007-10-29 16:35:55 · 6 answers · asked by tessa 1

i was asked to find the 600th derivative of F(x)=xe^-x

2007-10-29 16:30:33 · 3 answers · asked by joech_02 1

ex 6, 28, etc......????????? plz help

2007-10-29 16:27:18 · 2 answers · asked by alteclansinga 1

I need to find the surface area and the volume but I dont know the height the radus is 7 and the slant height is 25

2007-10-29 16:16:07 · 7 answers · asked by Lavonna w 1

find the percent increase or decrease

9 to 5

2007-10-29 16:05:49 · 7 answers · asked by Anonymous

I don't see where the x^2 in the denom has gone.
x+1/14x^4-5/(x^3-3x^2)

They say the LCD is 14x^4(x-3)
but where has the x^2 'gone'?

2007-10-29 16:04:47 · 1 answers · asked by c0cky 5

Let's say an integer n satisfies φ(n) = 1000. What are all the primes that might possibly divide n?

2007-10-29 15:55:39 · 2 answers · asked by 3545 2

3x^3 - 15x^2 + 18x

Russian Peasant method doesn't work...

with the quadratic formula i get...
(15 +/- 3) divided by 6

but the problem asks me to factor.. not solve.. and plus it cannot be solved since the original problem did not equal anything

any ideas?

2007-10-29 15:49:51 · 10 answers · asked by Mr.Deeds 5

Hi there,
I'm struggling with trying to find the zeros of the following;
x^4+25x^2+144
x^4-8x^3+17x^2-8x+16

Any help would be greatly appreciated. Thanks!

2007-10-29 15:49:21 · 2 answers · asked by Quasar 2

I think it has something to do with ^3 radical 64 ^2.

2007-10-29 15:44:59 · 6 answers · asked by Anonymous

test are 60% and quizes are 40% of total grade
tests 95 and 57
quizes 100 and 50

what is the lowest i can make on my next test to still be passing or am i already failing?

2007-10-29 15:44:48 · 4 answers · asked by Anonymous

Solve:

x^2-4x=0
3x^2-21x+36=0
x^2+1=-8

SOLVE BY COMPLETING THE SQUARE:

x^2-4x+3=0
x^2-6x+25=0

2007-10-29 15:35:14 · 4 answers · asked by Anonymous

Hey… We were given this problem in class and I am having a difficult time solving/ understanding the question. I tried finding the resultant vector and then proceeding from there but then I got all sorts of awkward answers….

Here’s what I tried to find the magnitude:
√((Magnitude)cos (angle) + (Magnitude2) cos(angle2 ) + (Magnitude)sin (angle) + (Magnitude2) sin(angle2 ))

I then used tan to find the angles but this I believe was incorrect. Could someone perhaps attempt the problem and explain/ show how to do it? Thanks a bunch for your help:)

Here’s the problem:
A bus weighing 6,075 pounds exerts a force of 5,385 pounds on a hill where it is parked. What angle does the hill make with the horizontal? What force must be exerted by the brakes to prevent the bus from rolling down the hill?

2007-10-29 15:33:22 · 2 answers · asked by Anonymous

Hey… We were given this problem in class and I am having a difficult time solving/ understanding the question. I tried finding the resultant vector and then proceeding from there but then I got all sorts of awkward answers….

Here’s what I tried to find the magnitude:
√((Magnitude)cos (angle) + (Magnitude2) cos(angle2 ) + (Magnitude)sin (angle) + (Magnitude2) sin(angle2 ))

I then used tan to find the angles but this I believe was incorrect. Could someone perhaps attempt the problem and explain/ show how to do it? Thanks a bunch for your help:)

Here’s the problem:

An airplane with an air speed (speed in still air) of 178 m.p.h. is headed due North (90°). If a west wind (180°) of 20m.p.h is blowing, determine the direction travelled by the place and its ground speed (actual speed with respect to the ground).

2007-10-29 15:29:40 · 2 answers · asked by Anonymous

a gameboy costs $56.77 it is on sale for 33% you have a coupon for an extra 15% off how much will the gamebo cost

2007-10-29 15:19:40 · 7 answers · asked by Anonymous

f(x)= (x + a)(x - a)

2007-10-29 15:08:39 · 2 answers · asked by MusicLuvr 5

Classify /_\ABC by its angles when m/_A = 32, m/_b = 85, and m /_C = 63.

2007-10-29 15:07:45 · 4 answers · asked by pkbrauer 1

Joe bought 1/2 a case of cokes, and gave 1/6 of what he has to Sam.Mary bought 1/3 a case of cokes, and gave 1/4 of what she ahs to Sheila. How many more cokes did Sam have than Shelia?

2007-10-29 15:07:08 · 6 answers · asked by gizzydivenx3 1

Find a 6 digit number in which the first digit is one more than the third, the the second digit is one less than the fourth, the fifth digit is one less than the third, and the sixth digit is one more than the fourth. the sum of the second and third digit is equal to the first digit. the sum of all the digits 30..................please some one help me with this i have be racking my old brain(31 years old) trying to help my niece with this problem

2007-10-29 15:06:21 · 3 answers · asked by kellissandria 1