Mathematics (Science & Mathematics) - 10 July 2007

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evaluate a - 13 when a =33?

cant figure it out what the evalate

2007-07-10 08:41:38 · 16 answers · asked by Anonymous

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how do you get a 20 degrees angle without using a protractor or compass?

my teacher set this for me and i will get 5 points/merits for my house if i find this out, so please help. I'm in desperation

2007-07-10 08:11:06 · 21 answers · asked by Anonymous

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how many times can you subtract the number 5 from 25.?

2007-07-10 08:09:38 · 32 answers · asked by Anonymous

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Could someone help explain a few math problems to me?

I just need someone to explain these three problems to me. I'm really stuck on #3, so be sure to give me a clear explanation on that one.

1. In a certain cereal, the ratio of wheat flakes to raisins to almonds is 14:2:1. If (1/4) cup of cereal contains 5 raisins, how many more wheat flakes than almonds are there in 2 cups of cereal?

2. If 3a=2b and 3b=5c, what is the ratio of a to c?

3. If (ab)/c=7=(rs)/t, r=3a, c=2t, and s=kb, what is k?

2007-07-10 07:45:24 · 6 answers · asked by Anthony W 2

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This one has me stuck, also..?

Y^2-24-23y

Please explain, also.

2007-07-10 07:45:06 · 4 answers · asked by Anonymous

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Why a billion in the US (1 with 9 zeros) is different than from the rest of the countries (1 with 12 zeros)?

2007-07-10 07:36:34 · 7 answers · asked by jagus 1

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How do you calculate the cubic size of an item when your measurements are in inches?

18.5" x 18.5" x 29"

2007-07-10 07:29:35 · 7 answers · asked by kdvonclarke2 1

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Simplifing!!??!?

How in the world do you simplify this!! I have no clue how to do it?
(4x-3)(5x^2+3x-2)

Take me step by step please!

2007-07-10 07:23:25 · 3 answers · asked by Brenda m 1

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could someone help me with some math?

I just need someone to explain these three problems.

1. Participation in team sport in a certain college was up 25% at the end of last year, but participation in individual sports like tennis were down 25 %. The ratio of students participating in team sports to students taking part in individual sports was how many times grater at the end of the year than the ratio at the beginning of the year?

2. What is the ratio of the circumference of circle to its radius?
A. 1
B. (pi)/2
C. sqrt (pi)
D. pi
E. 2*(pi)

3. 40 gallons of a certain mixture is made up of 3 parts of water and 5 parts of Liquid X. if the mixture must be changed in order to be 75% Liquid X, how many gallons of Liquid X must be added to the origianl mixture?
A) 15
B) 20
C) 35
D) 50
E) 60

2007-07-10 07:19:48 · 4 answers · asked by Anthony W 2

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What is 100% of 1?

2007-07-10 07:17:53 · 20 answers · asked by Alexander 6

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Factoring algebra?

12x^2+42x-24

&

8x^2+6x-35

2007-07-10 07:10:01 · 6 answers · asked by Anonymous

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cube root of 24+ 5 cuberoot of 81 would it be 17 times the cube root of 3?

2007-07-10 07:05:23 · 7 answers · asked by lzhnyk 1

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Factor the polynomial completely...?

10(x + y)^2 - 11(x + y) - 6

2007-07-10 07:00:31 · 5 answers · asked by casper5 3

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269 is what percent of 400?

the answer should be some where in the ball park of 67.3%

I wanna know how you did the math to find the answer!

2007-07-10 06:57:12 · 11 answers · asked by I have a question 3

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Algebra: Solve and explain please....?

(-8x^3-8x^2+5)(2x^2-x)

I get to the last line and then have trouble combining terms.

2007-07-10 06:56:39 · 4 answers · asked by Anonymous

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homework help!!!?

find all real-number solutions

x^4-7x^3-8x-56=0

2007-07-10 06:51:49 · 5 answers · asked by Anonymous

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sqare root of 3( the sqare root of 5 + the sqare root of 7)?

2007-07-10 06:48:20 · 8 answers · asked by lzhnyk 1

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Solve for X: 5(3x+2)-3(4x-3)= -2?

I keep getting different answers and none of them equal -2 when I check my work, can someone help.

2007-07-10 06:47:44 · 13 answers · asked by jmarc5069 1

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Easy graphing question?

Ok, Im learning about graphing and I cant get ahold of my teacher to ask her this question so I thought I would bring it here. Im trying wright the equation of a line with given slope and y-intercept.
This is the question.

Slope: -2; y-intercept: (0, 4)

I believe if you turned this into a equasion you would have
y= -2x + 4

Now this is where I think I am messing up. When you plot this on a graph I go to (0,4) and then I go back 2 points to make -2. This would create a strait line. Is this correct?

2007-07-10 06:44:59 · 9 answers · asked by trevor s 2

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Use the substitution x = sin² θ to show that ∫ √[x/(1-x)] dx = ∫ 2sin² θ dθ.?

2007-07-10 06:42:59 · 2 answers · asked by Anonymous

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Add (x/x+2)+(2/5)?

I got 2x/2x+5 is this right?

2007-07-10 06:40:34 · 4 answers · asked by jmarc5069 1

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(7/3w)+(5/3w^2)?

I understand how to add fractions but what do I need to do know that there is a power involved? Someone help the examples I have are not helping me

2007-07-10 06:38:04 · 5 answers · asked by jmarc5069 1

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algebra!!!!!?

findallreal-numbersolutions.

2x^3-6x^2=0

thankyou!

2007-07-10 06:36:05 · 6 answers · asked by Anonymous

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I'm not really sure how to do this can someone please explain? 3^2(5^2+7^2)?

2007-07-10 06:35:24 · 4 answers · asked by lzhnyk 1

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y''+λy = 0 ... y'(0)=0 ... y'(π)=0?

the problem says that the eigenvalues are all nonnegative, so you don't need to check that, simply what happens when λ=0 and when λ is positive.

Then says, determine if λ=0 is an eigenvalue, then find the positive eignvalues and associated eigenfunctions.

I've tried this several times, but can't quite figure out what I'm doing wrong.

btw the answer in the book says:

Eigenvalue λ[subscript 0]=0 with eigenfunction y[subscript ](x) ≡ 1, and positive eigenvalues {n^2} with associated eigenfunctions {cos nx} for n=1,2,3...

2007-07-10 06:23:21 · 2 answers · asked by grompfet 5

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