Mathematics - 30 December 2007

If 4(x+y)(x-y)=40 and x-y=20, what is the value of x+y?

Please explain how to do this. thanks

2007-12-30 13:00:43 · 3 answers · asked by J 2

How many neutrons and protons (nucleons) does an atom with the symbol (33 on top, with a 16 underneath the next to S) have?
a. 33
b. 16
c. 49
d. 17
e. None of the above.

2007-12-30 12:49:17 · 4 answers · asked by Charlie W 1

dont know

2007-12-30 12:23:42 · 24 answers · asked by Anonymous

for each function state
a) the max/min value
b) The value of x for which max/min value occurs

y=2x²-8x+15

2007-12-30 11:43:28 · 7 answers · asked by orangeisthenewpink 1

prove the identity sin^20/1-cos0=sec 0+1/sec 0

2007-12-30 11:32:16 · 6 answers · asked by unique1995 1

2007-12-30 11:26:25 · 8 answers · asked by Janelle Alexandria 3

Okay my teacher teaches something new everyday and uh it's not easy to remember everything so I'm asking for help on this please :]

Here are 2 questions, can someone please explain how I answer them?

1) y = 4x + 2
2 9x - 5y = 4

2007-12-30 11:23:59 · 5 answers · asked by Anonymous

2x^2 + 5x – 12
______________
9x^2 – 16

Divided By:

2x^2 – 7x + 6
______________
3x^2 – x – 4

2007-12-30 11:15:49 · 3 answers · asked by Abena 2

write the first 4 terms when

Un+2=Un+1 + Un , where,u1=1 and U2=1

I got the impression that U2 would have to be more than 1 as un+1+un=u2 (is that right), if it is then u2= more than 1 ??????
As you can see im trying too hard and should be out there drinking alchohol. If you can, then please answer, (its going to a good cause). Thanks and happy new year

2007-12-30 10:59:04 · 4 answers · asked by jimspike200 1

2007-12-30 10:54:36 · 3 answers · asked by johnrbrayjr1928 1

I have a 27:63:90 triangle and I need to find the ratios of the sides, but i dont have any side lengths. How would I do this?

2007-12-30 10:53:27 · 3 answers · asked by Anonymous

The terms are (1) (2,3) (4,5,6) (7,8,9,10) (11,12,13,14,15)
pls show you arrived at this answer and include any necessary formulas that you used to derive the answer

2007-12-30 10:42:00 · 5 answers · asked by sparkle_disliker 3

This is where i have 2 problems. PLEASE DONT GIVE ME THE ANSWERS I DONT WANT THEM SOLVED JUST THE PARTS I'M STUCK ON:
Problem:
x+2y=10
2x-y=5
(This is 1 problem)
So I dd this:
2x-y=5
and made it y=3x
So then I did the next problem filling in y
x+2(3x)=10
x+6x=10
NOW WHAT?
Isnt it supposed to equal?
Where did I go wrong?
please just help me where I am stuck and don't solve it.
THANKS

2007-12-30 10:37:35 · 6 answers · asked by Kiana 3

How can you solve these questions? I will post a few. Please try to solve at least one or one someone hasn't solved. Please also don't tell me to do my homework, I am doing it and don't understand thanks.

1) x^4+9x^2-10 <= 0
2) x^3+x^2-6x > 0
3) (x+3)x^2(x-2)^3 => 0


Thank u.

2007-12-30 10:36:36 · 2 answers · asked by myname_isalbert 1

what is $17.99 minus 25%?

2007-12-30 10:29:08 · 7 answers · asked by Anonymous

We live in a universe full of integers as when everthing is put to basics it is an integernumber of quarks or strings for that matter. Is it possible for a number with an infinite level of decimal figures to exist.

2007-12-30 10:28:25 · 2 answers · asked by Anonymous

I remember in Pre-Calculus, my teacher told us to make sure we were using capital or lowercase letters in our trig identities correctly. There was a difference between:

cos(Θ)=a/h

and

Cos(Θ)=a/h


I don't remember what the difference in solving the problem was.

I would appreciate your help!

2007-12-30 09:56:22 · 7 answers · asked by Jessi 1

What is the square root of (n to the 3rd power)

2007-12-30 09:55:38 · 20 answers · asked by em 2

How can you solve these questions? I will post a few. Please try to solve at least one or one someone hasn't solved. Please also don't tell me to do my homework, I am doing it and don't understand thanks.

1) x^4+9x^2-10 <= 0
2) x^3+x^2-6x > 0
3) x^4+x^3-2x^2-2x => 0
Just tell me if #3 equals x=2,-3,-1

Thank u.

2007-12-30 09:45:09 · 3 answers · asked by myname_isalbert 1

Please help! I'm having the hardest time finding the next number. If you find it, please tell me the way in which you found it! Thnx
http://i158.photobucket.com/albums/t88/liliananas/jks.jpg

2007-12-30 09:44:42 · 5 answers · asked by Jellystar 2

I am recently in an Algebra class and I am only okay at it. Would aomeone answer this question with all the steps please.
What is the sguare root of?
[ 144 x10 y12 z16]

2007-12-30 09:37:36 · 7 answers · asked by Crissiek 1

Stan invested $32,000, part at 6% and part at 5%. If the total interest at the end of the year is $1,770, how much did he invest at 6%?

2007-12-30 09:20:01 · 3 answers · asked by Anonymous

-3x + 4
----- -------
x^2-9 2x-6


my answer=-2x^2-18x-36
---------------
(2x-6)(x+3)(x-3)

2007-12-30 09:14:25 · 5 answers · asked by Anonymous

Perform the indicated operations:
√[50] + 2√[32] – √[8]


Multiply:
(5√[2] + 3)(√[2] – 2√[3])

Rationalize the denominator:
2
__________
√[6] – √[5]

2007-12-30 09:10:31 · 4 answers · asked by Abena 2

*The quantity of (4x-1) is raised to the 1/2 power or squarerooted.

2007-12-30 09:09:36 · 4 answers · asked by x 1

The math problem is:
The length of a rectangle is 3 more than twice its width. The perimeter is 48 feet. Find the width.
This is how you solve it:
L = 2W + 3
P = 2L + 2W = 48

2(2W + 3) + 2W = 48
4W + 6 +2W = 48
6W + 6 = 48
6W = 42
W = 7


I'm a little confused when it comes to this part...
2(2W + 3) + 2W = 48
^ i don't understand where you get this 2 from?


can someone please clarify this to me for 10 points =)



Thnk you
Happy n healthy new year :]

2007-12-30 08:44:42 · 10 answers · asked by H0llywoodzZ Star (: 2

2007-12-30 08:41:26 · 9 answers · asked by D*Star 1

2007-12-30 08:26:48 · 2 answers · asked by AyeBay 2

2007-12-30 08:20:46 · 4 answers · asked by Victor V 1

Jaime and her friend can keyboard 45 words per minute. Six other students in the class can type 30 words per minute. Four students have not yet timed their speed. Find the ratio of students who have timed their keyboarding to those who have not.

.5
2
.7
1.5

2007-12-30 08:16:46 · 4 answers · asked by sunny p 1