Mathematics - 27 December 2007

2007-12-27 11:54:35 · 5 answers · asked by Chrisy 1

1. 5-3i/1-i

2. x squared -4x +5= 0 (-b formuka)

Thank you

2007-12-27 11:52:55 · 4 answers · asked by isaac b 2

2007-12-27 11:52:26 · 7 answers · asked by Anonymous

14x+25-11x=37
23x+18-12x=62
37x-14+19x=154
31x-22+11x=188
36x-21-24x=-105

2007-12-27 11:48:42 · 6 answers · asked by Anonymous

2007-12-27 11:29:43 · 8 answers · asked by Anonymous

2007-12-27 11:23:16 · 4 answers · asked by Chrisy 1

2007-12-27 11:18:10 · 5 answers · asked by Anonymous

2007-12-27 11:14:54 · 9 answers · asked by bernicenena 1

Hi i've had a bash at these questions and i've included my answers. Would someone mind checking them and if they're incorrect include the correct theory?
Thanks

Convert rads into degrees
a) π/3 rads
b) 4π rads
c) 11π/6 rads

my answers:
a) 60 deg
b) 720 deg
c) 330 deg

Convert degrees into rads
a) 36 deg
b) 108 deg
c) 540 deg

my answers
a) π/5 rads
b) π/1.6 rads
c) 3π

Thanks!!

2007-12-27 11:06:47 · 8 answers · asked by Anonymous

5max^2+20ma

2007-12-27 10:54:42 · 4 answers · asked by Anonymous

Say there is a number that is 4 digits. The middle two numbers are 10. So right now it looks like this : _10_. What numbers can you fill the blanks in with so the 4 digit number is divisible by 72. How many number arrangements like that can be made? If you don't get it ask, because I cant solve it myself. And don't tell me how to solve it because I know basically how. And don't tell me to do it myself because its not even my problem. Its my 10 year old cousins who goes to some special math school who needs it.

2007-12-27 10:50:53 · 4 answers · asked by dramaqueen_95 1

c+3/c-1=c+2/c-3

2007-12-27 10:50:06 · 6 answers · asked by Anonymous

Thanks!

2007-12-27 10:40:27 · 7 answers · asked by Christina S 1

I have a right quadrilateral (rectangle) of sides A and B.

I need to find the foci of an ellipse that will fit tangent to the center points of all four sides of the rectangle, using nothing but a compass and straight edge.

"Quickie Diagram"
http://i122.photobucket.com/albums/o248/Web_Eagle/fociproblem.gif

I suspect the answer will involve bisecting the sides, setting the compass equal to the diagonal of one of the quadrants, and then marking the longer center line from opposite edges.

BUT, I’m not positive, and on this particular project, I only get one shot. (This actually involves construction, where I will be drilling and cutting into a non-reproducible surface.)

Can anybody tell me clearly if I’m correct, or how else to find these foci? Best proof gets the points!

Thanks!

2007-12-27 10:35:16 · 2 answers · asked by web-eagle 3

Here are some examples of questions I have problems with:
1. log(x+2) + log(x-2) = log7

2. 2log(base2)^x-log(base2)(x-1) = 3

3. log(x-3)+logX= log7

2007-12-27 10:35:12 · 5 answers · asked by Anonymous

sixty-four cubes of the same size are used to form a larger cube. the outside of the new cube is sprayed with sparkles. how many of the smaller cubes will not have any sparkles on them?

please show the work.

thanks.

2007-12-27 10:32:53 · 6 answers · asked by bballdud123 2

"Show that for any integer n > 1, we have 1/e - 1/(ne) < (1 - 1/n)n < 1/e - 1/(2ne)."

Challenge yourselves!

2007-12-27 10:30:54 · 1 answers · asked by UnknownD 6

Change each log expression to an equivalent expression involving an exponent.

(1) logSUB(pi) (x) = 1/2

(2) In x = 4

What does "In" stand for?

2007-12-27 10:26:03 · 3 answers · asked by journey 1

Find the length of the third side of the right triangle.

side one = 4
Hypotenuse = 5

a. x = √33
b. x = 3
c. x = √65 - 3
d. x = 3 -1

2007-12-27 10:21:28 · 4 answers · asked by . 1

Change each exponential expression to an equivalent expression involving a logarithm.

(1) 3^x = 4.6

(2) e^(2.2) = M

2007-12-27 10:20:48 · 6 answers · asked by journey 1

what is the derivative of this?

y(x^3) -2(y^2)x=4

2007-12-27 09:56:14 · 2 answers · asked by Haya 1

if (x^2)[(ln^2)(x)], then what does y'=?

i'm especially confused with the ln squared...how do you multiply with that?

2007-12-27 09:51:17 · 1 answers · asked by Haya 1

a season record for the bulldogs baseball team is shown. what percent of games did the bulldogs win?

the won 7 games, loss 5 games and 3 ties

2007-12-27 09:47:18 · 6 answers · asked by Anonymous

Some people manage square root signs, powers and all sorts, while I struggle with ^2 and sqrt and log(base3).
Can anyone show me how to do it, please?

2007-12-27 09:42:42 · 7 answers · asked by Anonymous

I have down's

i knew i had downs since i was born and all my life people have been saying things to me like Hey buddY! you will never play soccer


watch as be amazeed at i prove em wrong




Y = x^2

dy/dx =2x




I did it

its not maginc and i proved ppl wrong

i have to go now cause my mom is buying me dinner
to celebrate

2007-12-27 09:34:14 · 5 answers · asked by Anonymous

i actually did try and do this problem, but i think im just.. really wrong.. so i need help. ... and this is my first time to do anything with the exponent 'law' so it would be nice if you could give me 'hints' or somthing to solve this sorta problem.

how would i simplify 12x^9 / 4x^4

2007-12-27 09:29:24 · 9 answers · asked by :D 5

dy/dx=x-2/x



i got an answer of y=x-2lnx+ c and the back of the book says it's y=x-lnx^2 + c and idk how they got the squared. thanks

2007-12-27 09:17:54 · 6 answers · asked by bb 4

How would 7/c - 3/d divided by 4/d be simplified?

Thanks for the help!
10 points for the clearest answer!

2007-12-27 08:52:45 · 10 answers · asked by Simon F 2

i really need help with these problems

r=3s
r=10-4s

x=3y-4
2x-y=7

y=2x-5
x=2-4y

2007-12-27 08:49:41 · 4 answers · asked by Lindsay G 2

A) x/ (ln2x)
B) 1/ (x(ln 2x))
C) 1/ (ln 2x)
D) 2/(ln 2x)
E) 1/ (ln (ln 2x))

2007-12-27 08:46:51 · 7 answers · asked by Anonymous