Mathematics - 18 July 2007

Prove each identity.

(1) csc^2(x/2) = 2/(1 - cos(x))

(2) tan(x/2) = csc(x) - cot(x)

2007-07-18 23:46:26 · 3 answers · asked by journey 1

a1/5 or 2/10
b 3/7 or 6/21
c 10/15 or 4/6
d 1/3 or 33/100

2007-07-18 21:20:13 · 10 answers · asked by Anonymous

1/2=2/_=_/6=_/8=5/10=25/_=_/70=_/100
200/300=100/_=_/15=40/_=120/180=_/9=_/9
7/10=14/_=_/30=210/_=49/_=_/20

2007-07-18 21:17:48 · 4 answers · asked by Anonymous

2007-07-18 21:10:44 · 6 answers · asked by Anonymous

how to be good in math,....will you plz help me???

2007-07-18 21:10:39 · 17 answers · asked by dawn 1

Determine the slope of theline perpendicular to the line
-5x-3y+8=0 Please explain

2007-07-18 21:03:24 · 3 answers · asked by Anonymous

Describe the steps you would follow in graphing x+2y<=2. Include in your answer whether you use a solid or broken line and where you shade, above or below the line.

2007-07-18 21:01:18 · 4 answers · asked by Anonymous

No 2.) show the complex number Z=5L-150 degrees on ARGAND DIAGRAM and find Z in algebriac form.NO 3.Find the VOLUME of a parallelpiped with edges are given by these vectors:
A=2i-3j+4k
B=i+2j-k
C=3i-j+2k. I figure it out and got -7cmcube, since the volume can be either negative or positive. am i right? pls to maths genius.

2007-07-18 20:54:18 · 3 answers · asked by Joshua V 1

Alright, so we all know that when the discriminant is negative in the quadratic formula, negative roots are generated...
For a function f(x) = x^2 + x +1... are the imaginary roots

-0.5 + 0.866025i
-0.5 - 0.866025i

??

Please check up to verify my solution. Thank you all.

2007-07-18 20:48:38 · 1 answers · asked by LIFE HATER 1

2007-07-18 19:43:33 · 12 answers · asked by Anonymous

3/5x = 15

2007-07-18 19:32:27 · 15 answers · asked by Chronos 2 4

I'm not too good with searching for specific things, especially dealing with data.

I have a math project to do, and my teacher wants us to find a real life "phenomena" that has increases and levels out. It should also resemble a square root function. I really have no clue where to start.

If this makes sense, please help! Thanks!

2007-07-18 19:13:18 · 3 answers · asked by Anonymous

Complete the statement.
13 oz = _____g

A.) 364
B.) 390
C.) 360
D.) 156

13 oz = 368.543801 grams+ would the answer be none of the above or would i round up to 390 ? I'm confused.

2007-07-18 19:03:41 · 8 answers · asked by Anonymous

Find y' if (x+y)^2 = (2x - y)^3

After all the calculations my answer was for the derivative is 2(x+y) - 3(2x - y)^2.

Now i did this with respect to y but now that i look at it i dont know if i was suppose to take the derivative with respect to x or y...any ideas?

2007-07-18 19:03:17 · 3 answers · asked by Anonymous

I need help understanding how to figure DRT for microbiology. ex.What is the minimum time that contact lenses with a 10^2 bacteria should be soaked in chlorhexidine .001% that has a DRT value of 383.3 minutes. DRT is the time it takes to kill 90% of bacteria present.I AM NOT GOOD WITH MATH...need simple explanation that I can apply to future problems, PLEASE

2007-07-18 18:56:00 · 1 answers · asked by Anonymous

Estimate 121% of 600
a.) 75
b.)750
c.)72
d.) 720

121% of 600 = 726 so the answer would be D?

2007-07-18 18:55:48 · 6 answers · asked by Anonymous

2007-07-18 18:54:17 · 6 answers · asked by baby166_99 2

How do I solve this with an equation.The city zoo had 3.5 visitors on Saturday as it did on Monday. The difference in the number of visitors was 630. How many people visited the zoo on Saturday and Monday? Please help!

2007-07-18 18:48:41 · 2 answers · asked by manlisten 1

or does it have an independent existance

2007-07-18 18:30:56 · 10 answers · asked by Anonymous

2007-07-18 17:54:36 · 9 answers · asked by Anonymous

How do you integrate:
t^2 / (1+t^3)
Thanks a lot.

2007-07-18 17:52:03 · 7 answers · asked by jimmycheesemaster 2

Given cscx = (u^2+1)/(2u) and cot x < 0, find sinx, cosx, and tan x



pleeeasseee i'm so confused

2007-07-18 16:50:08 · 9 answers · asked by Juicy Baby 2

anyone

2007-07-18 16:25:52 · 8 answers · asked by snyderman802000 1

>>>find the dimensi0ns 0f a rectangLe wh0se perimeter is 240 m if the length is 4 m longer than the width.

>>>dave has six times as much m0ney as fred ,and bill has three times as much as fred . t0gether they have $550.how much d0es each have?

tx.

2007-07-18 16:21:02 · 11 answers · asked by mAY 2

2007-07-18 16:17:30 · 22 answers · asked by prendy 1

27 - 5.3 -0.7 =

-5.2 - (-1.2) + 5.3 =

-3 x (-41) =






-17.5 - (-7.8) - (-1.2) =

-7.6 - (-1.6) + 3.3




fractions

16/6 + 16/7 - 18/4 =


3 1/3 + (-6 3/4) =



-2/3 - (-1/12) =



-5/6 + (-2/9)


5 2/3 + (-8 3/10) =


-2/3 - (-1/4) =


-2/9 + (-5/6) =

2007-07-18 16:17:11 · 8 answers · asked by Ghazala 2

2007-07-18 16:11:39 · 9 answers · asked by red_red_downcast 1

There are 9 cards. Separate them into 3 stacks, each stack has 3 cards. Then, take away the cards, one at a time. You can only take card from the top. So, how many ways are there to take away all the 9 cards?
Please explain how you solve it. Thank you.

2007-07-18 16:09:23 · 6 answers · asked by nomade_contabile 1

What's a good way to memorize the trigonometric values of common angles? I have to know them by Friday.

2007-07-18 16:09:14 · 6 answers · asked by Anonymous

This year, 75% of a graduating class of harriet tubman high school had taken at least 8 math courses . Of the remaining class members, 60% had taken 6 or 7 math courses. What percent of the graduating class had taken fewer than 6 math courses? I would appreciate it if any1 can help with this.

2007-07-18 16:08:23 · 4 answers · asked by simbiat t 1