Mathematics - 9 July 2007

Find the angles vector B makes with the positive axes when vector b =i hat 6 - j hat 2 + k hat 3?

2007-07-09 17:27:07 · 2 answers · asked by Anonymous

2007-07-09 16:33:27 · 18 answers · asked by Anonymous

Well you know how 1-9, as in numbers not age, are called single digits, 13-19 are called teens , not as in age, and numbers like 21, 22, 23 are known as twenties, then what are the numbers 10-12 called? I was just wondering !
I hope I phrased it right to make it clear.

2007-07-09 16:27:11 · 4 answers · asked by sportspro93 1

If no digits can be repeated, how many 9-digit numbers can be made from the set {1 2 3 4 5 6 7 8 9} so that:
a) Every even digit has an odd digit before and after it?
b) All the even digits remain adjacent? ( I don't understand what is meant by this question.)

2007-07-09 16:26:18 · 2 answers · asked by C K 3

for example: number of scales of armadillo, number of feathers on a birds wing, stripes of a tiger or a zebra,

2007-07-09 16:08:48 · 2 answers · asked by keinah2 1

I have no clue how to factor. So please Show me the Way you did it.

x^2+5x+6 = ???

2007-07-09 16:00:19 · 11 answers · asked by Brenda m 1

A person randomly selexts answers to all 10 questions on a multiple choice quiz. each question has 1 correct answer and 3 incorrect answers. find the probability that the indicated number of answers are correct.

the formula

P=nCrp^r(1-p)^n-r

Question
Exactly 7

#2 Find the probability that a batter with each batting average given below will get at most 3 hits in the next 5 bats.

0.250

2007-07-09 15:56:59 · 4 answers · asked by Bird 2

Mutiply and Simplify
√20√18=2√5*3√2=6√10

1)How do you do √20√18 this please explain. I don't just give me the anwser, I want to know how to do it please.

2) How do you do √3³*5³

It doesn't make sense cause it would have to be √3*√5*√3*√5*√3*√5 and this would make no sense. Cause a √x² is like √x*√x

3) √432=√2^4*3³=4*3*√3=12√3
This doesn't make sense can someone explain this to me PLEEASE/Show steps.

2007-07-09 15:26:27 · 4 answers · asked by Anonymous

SERIOUS ANSWERERS ONLY.

2007-07-09 15:13:48 · 13 answers · asked by Anonymous

-5x^2 -x(x(4/x)+10) = -4x

-5(x-3) + 2 (3 - x) + x = -14 + x

2007-07-09 15:12:48 · 2 answers · asked by Arthur M 1

1) Why does √2²*7³= 2*7*√7?????


2) Using the same method.
√2^5*3²*7³=
doesn't make sense
3*7√2³*√7=21√56 this would be the final anwser, please explain

4) √20√18=2√5*3√2
Why can't i use 4*5 and 9*2???

What is the prime factor of 784?

What is a prime factor?

PLEASE IM SO CONFUSED MATH DOESN'T EVEN MAKES SENSE, THE √ ESPICALLY

2007-07-09 15:00:21 · 4 answers · asked by Anonymous

2007-07-09 14:52:28 · 4 answers · asked by zac797 1

I'm really bad at mathematics, and I really need help . . . so please help me. Well, first of all, I guess I could say I'm bad with algebra, or just variables. Like the following question.
- If the three digit numbers x and y are each composed of three distinct non-zero digits, what is the greatest possible value of x - y?

Please explain how to do the above problem, and the following one!
- In the addition problem below, if the letters A, B, and C represent different digits, what does each one equal?

AA + AB = CCC


Please help, and thanks ahead of time! (I really want to be as smart as all of you!)

2007-07-09 14:49:43 · 2 answers · asked by Anonymous

sin165 as sin(120+45) show that sin165 = root6-root2 / 2

I do get the answer but I get a plus sign not a negative...

Please help

2007-07-09 14:38:02 · 3 answers · asked by jin_ale 2

That's 5 equal parts for every 2 inches///How do I do it!?

2007-07-09 13:58:08 · 4 answers · asked by h 1

I know how to do 23*23 on paper, but not in my head. I only know that it ends with a 9. in my head is this natural???

I know how to remember
1²-17²
17²=289
18²=324
19²=361
20²=400
21²=441
22²=484
23²=beats me

2007-07-09 13:02:34 · 14 answers · asked by Anonymous

The price p dollars and the quantity x sold of a certain product obey the demand equation : x= -15p + 450 ; 0 is less than or equal to p, and p less than or equal to 30. it looks like this with the line under neath 0

2007-07-09 12:59:24 · 1 answers · asked by thepoet01 2

can u please tell me how to make a radical sign. i can never make it.

2007-07-09 12:57:32 · 2 answers · asked by Butterfly In The Sky 1

word problem. . . A developer wants to enclose a rectangular grassy lot that borders a city street for parking. If the developer has 200 feet of fencing and does not fence the side along the street, what is the largest area that can be enclosed?

It is an algebra question.

2007-07-09 12:55:47 · 14 answers · asked by thepoet01 2

Simplify each radical expression, then tell if the result is irrational or rational

√(1/18)

√(5.6)

-4√(7/8)

thanks if you can help!

2007-07-09 12:45:39 · 5 answers · asked by Anonymous

Find the slope and y-intercept of the lien represented by each of the following equations.

2x-3y=6

2007-07-09 12:43:42 · 4 answers · asked by Dawn M 1

I'm willing to give a best answer to the first person with the correct answer and who has explained how they did. I have already worked out the problem and I have the correct answer, but I feel like giving a best answer. I'd jump all over this; I appreciate math ^_^

2007-07-09 12:42:52 · 4 answers · asked by Do Anything and I Love Ya! 3

Victor Anderson, the owner of Anderson Belts, Inc., is studying absenteeism among his employees. His workforce is small, consisting of only five employees. For the last three years he recorded the following number of employee absences, in days, for each quarter.
Quarter
Year I II III IV
2001 4 10 7 3
2002 5 12 9 4
2003 6 16 12 4
Determine a typical seasonal index for each of the four quarters.

2007-07-09 12:36:22 · 2 answers · asked by Help please 1

is it possible??

2007-07-09 12:35:52 · 4 answers · asked by _cupcakes_ 1

The depth of a pool varies directly with how many gallons of water it will hold. If a 6 foot deep pool holds 10,000 gallons of water, a pool that holds 12,500 gallons of water should be __________inches deep, according to this theory.

2007-07-09 12:35:40 · 2 answers · asked by froggy 1

Some students simplify
2x^2 - 32
------------
x - 4
as
2x - 8
--------
bottom cancels out..

Choose the values of x to show this is not true. then simplify it correctly?
how do i do this? im completely lost..

2007-07-09 12:34:22 · 2 answers · asked by Anonymous

Suppose that Cindy rides her bike two miles in the same time it takes Bobby to ride his bike three miles. If Bobby rides his bike 5 mph faster than Cindy, find the speed of each rider.

If it's not too much trouble, could you show your work, so I can understand it better. Thanks.

2007-07-09 12:32:57 · 6 answers · asked by jaz 5

Boston and New York are approximately 280 miles apart. One Train leaves Boston traveling towards New York at an average speed of 80mph. Another train leaves New York at the same time traveling toward Boston at an average speed of 60 mph. (a) How long will it take them to meet? (b) How far has each train traveled when they meet?

I tried using d= rt but that didn't make much sense since I did
t = d/r which 280/80 = 3.5hours and 280/60 = 4.6 hours but the textbook says two. I'm a so confused. I need help with explanations!!

2007-07-09 12:31:39 · 4 answers · asked by Kala J 3

Express the surface area S of a cube as a function of its volume V.

I know how to do it..its just the algebra is tricky.

do you do this? : v=x^3 then solve for x, x=3sqrtv

then plug into this s.a. equation: s=6(3sqrtv)^2

then what? (and am i right so far)

2007-07-09 12:28:37 · 6 answers · asked by Anonymous

What is the integral from '1' to '3' of 'e^(x^2)dx? You must find it using the right endpionts, and 5 rectangles.

I know the formula for right endpoints is the sum of R=1 to 'n' of 'f(XsubR)(change in x)

change in x= (b-a)/n... n is the number if rectangles

2007-07-09 12:25:26 · 2 answers · asked by A 3