Mathematics - 16 August 2007

Just a couple.

1. (-5-i)+(6+2i)

2. (2-5i)-(-3+2i)

3. (1-3i)*(3+i)

4. (5-2i)^2

5. i/(3i+4)

6. Last one-
2*sqroot(5x+1)-8=0

Thses are all I missed. I need to see where I made my error.

2007-08-16 08:17:10 · 4 answers · asked by Anonymous

I'm developing code for an embedded controller. I need to calculate the value of 10^x where x is a floating point number between -4 and 0.

I've tried using the built in C functions but they take too long.

I'm aware of a trick for whole values of x where you perform one calculation if x is odd and a different one if x is even. Afterward, you divide the binary value of x by 2 (shift x to the right one position) and repeat until x is 0.

Are there other tricks to calculate this value?

2007-08-16 08:13:25 · 6 answers · asked by Anonymous

3/4x+5/2

i forget how to do this...plz hlp!

2007-08-16 08:05:12 · 10 answers · asked by Little Yellow 4

I need help with the Algebra 1 question:

solve:

(This is the best i can do to make fractions, excuse the dots)

a+2 .....a+3
------ + ------ = 5
2a..........a

or:

(a+2)/2a+(a+3)/a=5

(please explain how to solve the problem, please. answer does not need to be included in answer, just an explanation)Thanks

2007-08-16 07:49:17 · 8 answers · asked by Lalala... 1

I cant remember... bin long time since i whuz at skewl...
i either make it 60k or 600k... slight difference...
anyone help me find the real value?

2007-08-16 07:49:04 · 12 answers · asked by z3b3rd33 3

y' + y = x, y(0) = 1.

2007-08-16 07:18:20 · 3 answers · asked by Anonymous

The parametricmequations are
x = t^3 - e^(-t), y = t^2 - e^(-2t)
(i) Find the equation to the curve at the point where t=0

The curve cuts the y-axis at the point A.
(ii) Show that the valu of t at A lies between 0 and 1.

2007-08-16 07:04:08 · 3 answers · asked by polol 2

PLEASE HELP I UNDERSTAND HOW THEY GOT THE FIRST PART OF THE ANSWER BUT THE 12XY IM LOST ON

2007-08-16 07:03:28 · 10 answers · asked by pouncey03 1

2007-08-16 06:50:07 · 8 answers · asked by tiger_gabriel98 1

Two parallel cylindrical wires made of lead have diameters D=4mm and the distance between their axes is L=5mm.

Both wires are in superconductive state. The wires carry currents I=30A each in opposite directions.

What is the force of magnetic relpulsion F between the wires per unit length (per 1 meter)?

Note:
Meissner effect: magnetic field does penetrate inside bulk lead (type I superconductor).


I asked this question 16 times in physics section, and got no answer. Maybe matematicians could help me.
Easy-to-use magnetic force calculator can be found here:
http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/wirfor.html

2007-08-16 06:48:51 · 3 answers · asked by Alexander 6

x +y=13

22x + 36y=356

2007-08-16 06:46:54 · 4 answers · asked by dianajiminez 1

(x+4)^(3/4) times (x+3)^(-2/3) minus (x+3)^(1/3) times (x+4)^(-1/4) all divided by [(x+4)^(3/4)]^2

please help as i am not sure where to even begin with this one

2007-08-16 06:45:08 · 2 answers · asked by confused 2

2007-08-16 06:26:19 · 10 answers · asked by autolicious95 1

x2 + y2 = 4
x2 + y2 = 16
(x + 1)2 + (y + 1)2 = 4
(x - 1)2 + (y - 1)2 = 16

2007-08-16 06:12:11 · 7 answers · asked by zerokun4 1

Square Root of(36x^2+24xy+4y^2=Square Root of(9x^2+54xy+81y^2
then which of the following expressions could be equal to y?

If x=x^2+y^2/-2y and y is not equal to 0 then y is equal to which of the following?

If x is not equal to -3/2, 2x^3-x^2-6x/2x+3

If x and y are both positive numbers and x^2+2xy+y^2=121

kind of get nervous with problems with x^2 and all and i dont know how to solve these please explain

2007-08-16 05:53:42 · 6 answers · asked by Unknown 2

2007-08-16 05:50:23 · 4 answers · asked by ultramaniac18 1

2007-08-16 05:47:38 · 23 answers · asked by Anonymous

i = sqrt (-1)
i ^ 2 = -1 [this I am certain of]

i ^ 2 = i * i
= sqrt(-1) * sqrt (-1)
= sqrt (-1 *-1 ) [line A]
= sqrt (1)
= + or - 1 [which can't be right]

I think there's a problem with [line A] but I can't work out why. Can anyone help?

2007-08-16 05:46:56 · 6 answers · asked by Anonymous

2007-08-16 05:14:44 · 7 answers · asked by Anonymous

this symbol ( ^ ) means to the power of .
Thanks a lot in advance

2007-08-16 04:38:51 · 8 answers · asked by Mystic healer 4

Prove the following:
1/If 2 sides of a triangle are unequal in length,then the greater side has the greater angle opposite it
2/Any 2 sides of a triangle are together greater in length than the third side.

2007-08-16 04:05:21 · 4 answers · asked by beuuu 2

2007-08-16 03:30:51 · 6 answers · asked by nick1995 1

2007-08-16 02:24:06 · 4 answers · asked by orhyswilliams 3

18.State the slope and y- intercept of the graph of 7x + 4y =28.
A. m=7/4,b= -7
B. m= -7/4,b= -7
C.m= -7/4,b=7
D.m=7/4,b=7

2007-08-16 02:05:46 · 5 answers · asked by Delilah 2

What must be the radius of a sphere so that it's volume is equal to its surface area? Pls disregard the units of measurement.. so you won't be confused.

Thanks!

2007-08-16 01:27:48 · 5 answers · asked by double B 2

2007-08-16 01:08:06 · 6 answers · asked by dandawow 1

How many different words of four letters(they should not neccesarily be the part of speech) can be formed from the letters R E A C T I O N, satisfying the following conditions:
(1) the letter N must exist in each and every word
(2) the letter T is not admitted at the end of the word (so the words like REACIONT are not what asked for).

Thnx in anticipation.

2007-08-16 01:03:50 · 2 answers · asked by Anonymous

well, if there is.. please suggest one.. if your asking the topic any would do...thanks...

2007-08-16 00:56:12 · 1 answers · asked by KairiCullen 1

2007-08-16 00:03:26 · 7 answers · asked by dying2cu 1