Mathematics - 3 September 2007

I'm very bad with trig, and we never learned how to prove these types of trig identities...

cos (x/2) = sqrt [(1+cosx) / 2]

and

sin (x/2) = sqrt [(1-cosx) / 2]

sqrt = square root...

Help please?

2007-09-03 07:55:53 · 3 answers · asked by Kate 3

this is a geometry problem

2007-09-03 07:52:41 · 8 answers · asked by Bianca C 1

Ok so like 3x + 5y - 12 = 3 terms right???

So how many terms does just the number 15 equal 0 or 1???

I dont get it; please help

2007-09-03 07:48:55 · 2 answers · asked by Anonymous

2007-09-03 07:44:16 · 9 answers · asked by suma p 1

Find the slope of each line. Then graph.

x = 5

How do you find the slope?!
Thanks in advance!

2007-09-03 07:40:27 · 8 answers · asked by Emma 3

Identify the slope and y-intercept for each line then graph:

y=2


I'm stuck. How do you know the slope and y-int?!

Is 2 the y-int and there is no slope?
Thanks in advance!

2007-09-03 07:37:25 · 5 answers · asked by Emma 3

2007-09-03 07:29:33 · 1 answers · asked by Anonymous

such that the first coordinate plus the second coordinate equals 3, and the square of the first coordinate minus the square of the second coordinate equals -9.

2007-09-03 07:27:16 · 2 answers · asked by Anonymous

state the domain of f(g(x)) if f(X) = squareroot x+2 and g(x) =3/x

2007-09-03 07:21:06 · 3 answers · asked by Ballerina 5

Suppose your car contains just one gallon of gas. Driving at 20 mi/h you can go 26 mi. Likewise, you can go 34 mi driving at 40 mi/h and 32 mi driving at 50 mi/h.

a. find a quadratic function that models this data
b. how far could you go if you drove at 65 mi/h
c. the nearest gas station is 16mi away. if the speed limit is 55mi/h, at what maximum speed could you drive and still reach it?

2007-09-03 07:00:59 · 2 answers · asked by Anonymous

what to do if I need to find the square root for 8

2007-09-03 06:54:18 · 2 answers · asked by Anonymous

I should know this but I totally forgot how to do it.
Thank you for the help.

2007-09-03 06:53:39 · 4 answers · asked by ben80 2

Ok, so I asked this question last night, and thought I understood it, but there's 2 parts I can't seem to get...

[f(x+h) - f(x)] / h
Where A. f(x) = 1 / (x + 1) ; B. f(x) = x^2

Sorry but I just don't understand this stuff... help??

2007-09-03 06:52:39 · 1 answers · asked by Kate 3

sin (9pi/4) using coterminal angle to find the exact value without a calculator.

(pi/4) * (9pi/4) = (8pi/4) + (pi/4) = 2pi + (pi/4) so sin (9pi/4)=sin 2pi +(pi/4) and =sin(pi/4) = 1

did I do this right???


how would I do sec 540 degrees??


please help and explain, thanks

2007-09-03 06:43:04 · 3 answers · asked by rickyricardoiscool 1

Joe spent 1/5 of his money on books. He spent 3/8 of the remainder on a recorder. He has $250 left. What fraction of his money does he have left?

2007-09-03 06:41:54 · 5 answers · asked by lucious l 1

2x(-3)x(5)
_______

3x(2)



( ) = exponent



please explain how to simplify

2007-09-03 06:37:45 · 9 answers · asked by krissy 1

To help meet expenses we are raising the price of pizza by 15% how much should we raise the price if the pizza is selling for $14.80?

I thought the answer was $2.22. The answer sheet says $2.20?
How is this possible?

2007-09-03 06:37:29 · 8 answers · asked by Jim C 1

Whitney invested $23,000, part at 2% and part at 12%. If the total interest at the end of the year is $1,260, how much did she invest at 2%?

2007-09-03 06:35:47 · 2 answers · asked by ray 1

I have a math problem: 3 People share income and loss in a 3:2:1 ratio. Does that mean 30%, 20%, and 10% or what? If someone can tell me what this means then I can finish the rest of the problem. Thanks

2007-09-03 06:26:56 · 3 answers · asked by PreciousLady 3

Thanks!

2007-09-03 06:25:23 · 5 answers · asked by foreverhero14 1

I need help with these math questions. I would like the answer and a quick explanation. okay, there are a few, but the first person to answer these correctly gets best answer.

Simplify these expressions
1. the square root of 75/225
2. the square root of 21 v squared/324
3. the square root of 94t/196
4. " " " of 171cd squared
5. " " " of 152 m squared n
6. " " " of 126x squared y squared
7. " " " of 23w squared/49
8." " " of 45rt squared/144
9. " " " of 76p squared q squared/81
10. " " " of 320/441
11. " " " of 117f
REMEMBER: PLEASE ONLY SIMPLIFY THESE EXPRESSIONS.
I DONT NEED AN EXPLANATION FOR EACH ONE, I JUST NEED ONE EXPLANATION, AND ANSWERS.

Thank you very much for helping. :)

2007-09-03 06:04:36 · 1 answers · asked by Anonymous

please solve and explain b/c i do not understand these:

Write an equation of the line which has the given slope, m, and which passes through the given point. m= -5; ( 9,1)




Write an equation of the line which has the given slope, m, and which passes through the given point: m = - 1/2 ; (8, -5)

2007-09-03 06:03:58 · 1 answers · asked by Trever 1

Well, after looking through my Algebra I homework, I come to this problem:

A number plus five, divided by two, added to the quotient of that same number minus one, divided also by two, has a sum of that number minus one, divided by three.

Simply put, [(x+5)/2]+[(x-1)/2] equals [(x-1)/3].

These are all fractions, and when I solved it, I got a soultion of 3.5, which doesn't seem right. I multiplied the entire expression by the LCD, six, and divided the resulting binomials by the monomials in the denominator. It still doesn't seem right.

Did I make a mistake? How do I solve this?

2007-09-03 05:59:35 · 3 answers · asked by Sean 3

Please help this is a homework problem and I dont know how to solve it????

2007-09-03 05:42:25 · 1 answers · asked by dmmdmustang 2

jerry is 2.1 m tall, how tall is a scale model of jerry that is 10% of his size?

2007-09-03 05:25:07 · 5 answers · asked by Anonymous

A boat is tied to a pier with a 25 foot rope so that the distance between the top of the pier and the top of the boat deck is 7 feet. If the water level goes down 8 feet with the low tide, how much closer (in feet) is the boat to the base of the pier? Assume the rope is always taut?

2007-09-03 05:24:47 · 3 answers · asked by la la la 2

and how math is so complicated and algebra dont let me get started

2007-09-03 05:15:02 · 11 answers · asked by ? 5

Can someone please solve this and show all work!!???:

3x/2 + 1/4(x-2)=10

2007-09-03 05:15:02 · 10 answers · asked by Anonymous

i need u to explain it to me because my dad didnt explain it good

2007-09-03 05:14:43 · 6 answers · asked by yungone 2

2007-09-03 05:11:20 · 8 answers · asked by Martha Deacon 1