Mathematics - 7 June 2007

I have solved this equation and my result is q=e*C(1-exp(t/RC))
However, the books gives q=e*C(1-exp(-t/RC))
What's wrong with my result???

2007-06-07 17:29:46 · 2 answers · asked by Minh Nguyen 1

the main question that I have is how to rationalize this equation (the steps). here is the equation: 1/1+rad3-rad5

the answer should be: 7+3rad3+rad5+2rad15/11.....how do you get this answer?

2007-06-07 17:24:27 · 2 answers · asked by Haya 1

question is ...prediction for when rocket would hit ground

equation is Y=a(x-h)^2+k

then i did

0=-5(x-7)^2+245

then v do

-5(x-7)^2=245

what do v do next?????

2007-06-07 17:19:43 · 10 answers · asked by Farida 2

2007-06-07 17:03:00 · 11 answers · asked by Idyllic 3

2007-06-07 16:56:26 · 6 answers · asked by Anonymous

2007-06-07 16:41:26 · 9 answers · asked by shemarparker 1

7e^x - e^2x = 12

I end up with no solution because x = ln[12 / (7-e^2)] which evaluates to the ln of a negative number, which is undefined.
Not 100% sure I did it right, though.

2007-06-07 16:39:56 · 5 answers · asked by Anonymous

Hey everyone! I really need some help here. I've been working on it all this week now and I can't seem to get an answer. Any help would be much appreciated, thank you.

****I have added a link to the sketch of the problem for the visualization here:

http://i11.photobucket.com/albums/a197/arminvanbuuren/feedlotproblem.gif

There's a feedlot 200 feet long with a water trough along one edge and a feed bin located on an adjacent angle. A cow enters the gate at point A (90 vertical feet from the water trough). She walks straight to point P, gets a drink from the trough, and then walks straight to the feed bin at point B (60 vertical feed from the water trough). If the cow knew calculus, what point P along the water trough would she select to minizmize the total distance she walks?

2007-06-07 16:39:49 · 2 answers · asked by chaChaCha_Chauncey B_b_B_billups 1

2007-06-07 16:27:57 · 4 answers · asked by toepic24 1

thank you

2007-06-07 16:24:20 · 3 answers · asked by Kae Cie Marie 1

thank you!

2007-06-07 15:59:11 · 9 answers · asked by Kae Cie Marie 1

The average weight for a group of 20 women is 130 pounds. If the average weight for 3/4 of these women was 140 pounds, what was the average weight, in pounds, for the rest of the women?

I figured out the answer by just thinking about it but would like to know how to set up a formula/problem to solve for x. I'm a little rusty with my algebra. Thanks.

2007-06-07 15:52:59 · 3 answers · asked by justmeeh 2

2007-06-07 15:48:23 · 12 answers · asked by Michael M 1

a picture window is in the shape of an equilateral triangle. Each side measures 4m. Celia will glue a rectangular piece of stained glass on the window so that one side of the rectangle lies on the base of the triangle. Determine the max area for the piece of stained glass.

the answer should be 2squareroot3

plz show all work :) Thank u

2007-06-07 15:46:50 · 2 answers · asked by Anonymous

2007-06-07 15:44:17 · 3 answers · asked by Anonymous

I accidentally stumbled upon an apparent trigonometric relationship.

cos(20°) = cos(40°) + cos(80°)

Please prove or disprove the equation. I’m not looking for someone to just type it into their calculator. I already know that it seems to be true but the proof is elusive.

2007-06-07 15:39:21 · 2 answers · asked by Northstar 7

Part b.
Change it to standard for and shoe how to use the discriminant to verify the number of x-intercepts
Part c.
what are the solutions?

thank you so much!

2007-06-07 15:37:33 · 2 answers · asked by Kae Cie Marie 1

ok now that im finally learning these they had to put one in here that i can not get right

2007-06-07 15:25:22 · 6 answers · asked by Anonymous

2007-06-07 15:23:59 · 5 answers · asked by Anonymous

x +7 (7x *10) =80

x +49x *70 = 80

50x *70 = 80
-70 = -70
50x = 10

is there another way to re-write this ??

2007-06-07 15:21:39 · 15 answers · asked by Anonymous

is this right
((sinθ)(secθ))/(tanθ)
sinθ*(1/cosθ)/(sinθ/cosθ)
the sin and cos cross out and you are left with 1

2007-06-07 15:19:13 · 5 answers · asked by Anonymous

2007-06-07 15:08:41 · 12 answers · asked by Anonymous

i hav to make a project on this.....need some detail

2007-06-07 14:56:45 · 10 answers · asked by Anonymous

I cannot get this one even with looking at the function rules i also can not figure out

(1-sin^2θ/1-sinθ)-1

2007-06-07 14:49:44 · 4 answers · asked by Anonymous

3x+4y = 26
x-3y = 0

2007-06-07 14:47:36 · 8 answers · asked by blahhhhhh 2

a. y=1.5 sin 4 feida

b. y= -5 cos 1/2 feida

c. y= -2 sin ( feida - 30 degrees)

2007-06-07 14:47:10 · 5 answers · asked by ALI L 1

possible answers are the following:
a. {5,1}
b. {12,5}
c. {13,7}
d. {13,22}

2007-06-07 14:42:03 · 4 answers · asked by Anonymous

whats 3898 in roman numerals? as a said first person to answere correctly gets best answere.

2007-06-07 14:26:18 · 6 answers · asked by Johnny Boy 3

using addition to eliminate one of the variables:
a+3b = 4
2a-b = 1

2007-06-07 14:16:41 · 5 answers · asked by blahhhhhh 2

I need to use the quadratic formula to solve the equation x^2 - 17 x + 72 = 0 can anyone help? Thanks

2007-06-07 14:10:49 · 4 answers · asked by delphiniums 1