Mathematics - 21 October 2007

Please show your steps! Really need help! ><

Thank you so much!

2)Determine the quadratic function f(x)=ax^2+bx+c, such that f(x)+2x+8 = f(x+1), and f(1)=12.

3) For what values of x is the expression (|x|-1)(|x|+2) negative.

Thank You!

2007-10-21 15:53:55 · 5 answers · asked by Anonymous

This is what I did so far - Please help
4y+5+y=2
5y+5=2
5y= -3
y = -3/5

4(-3/5) + 5 + (-3/5) = 2
-12/5 + 5 + (-3/5) = 2
-15/5 + 5 = 2
-3 + 5 = 2
Why don't I have fractions for the answer?

2007-10-21 15:41:57 · 6 answers · asked by Anonymous

For each integer a, if there exists an integer n such that a divides 10n+1 and a divides 2n+1, then a divides 4.

2007-10-21 15:35:56 · 1 answers · asked by bandit8711 1

Given circle K with a radius of 5 cm, describe the locus of points in a plane that are 5 cm from the circle.

circle K with radius of 10 cm
point K
circle K with radius of 10 cm and point K
none of these

2007-10-21 15:18:56 · 4 answers · asked by Anonymous

perimeter 30.
table is twice as long as it is wide.
what is the lenght?

2007-10-21 15:13:43 · 3 answers · asked by miss s 2

given:

gamma=40
a=3
b=4

Have to find:

Beta , alpha, c

please help me and explain this to me step by step, thanks my book sucks!!

2007-10-21 15:13:13 · 2 answers · asked by Anonymous

be added to the 18 marbles already in the bag so that the probablity of randomly drawing a red marble is 3/5?

2007-10-21 14:47:46 · 2 answers · asked by dr.whooo 2

Please explain how to solve this problem.

2007-10-21 14:44:19 · 9 answers · asked by Griselle A 1

solve intergral of ((3x)/(x2-6x+9))dx using partial fractions to determine the antiderivitive that passes through the point (4,0)

i'm stuck

2007-10-21 14:39:58 · 1 answers · asked by Rogi P 1

2007-10-21 14:38:33 · 1 answers · asked by Anonymous

Is there a way to find the vertex of a circle? Like, say there is a circle and you need to find the diameter of it. You can only do that if you know where the vertex is so how do you do it?

2007-10-21 14:21:12 · 3 answers · asked by Josh 2

f(x,y) = (e^ (-x^2-y^2) )(x^(2) +2y^(2));

D is the disk x^2 + y^2 < or equal 4.

2007-10-21 14:15:06 · 1 answers · asked by JOE 2

i'm making a math project and i have to work out the quadratic nth sequence and a friend told me that i also had to work out the general rule. but i tought the general rule and the quadratic nth sequence were the same thing ???

2007-10-21 14:11:49 · 1 answers · asked by Ruben N 3

2007-10-21 14:09:04 · 9 answers · asked by Anonymous

Put the following equation into y=a(x-h)^2 + k
vertex is v(h,k)

y=3x^2 - 5x + 2

help! step by step please :)

2007-10-21 14:08:42 · 1 answers · asked by psxiloveyou 2

Let f: X->Y be a function, and suppose that x0 exists in X and y0 exists in Y and satisfy (x0, y0) exist in f. If (x,y) exists in f and x != x0, then y != y0.

I really have no idea what I am even supposed to prove any explanations would be greatly appreciated :)

2007-10-21 14:04:57 · 1 answers · asked by jay d 1

1. A Farmer uses a horizontal force of magnitude on a wagon and moves it a horizontal displacement of magnitude 3.2m. How much work has the farmer done on the wagon?

2. A tow truck does 3.2 kJ of work in pulling horizontally on a stalled truck to move it 1.8 m horizontally in the direction of the force. What is the magnitude of the force?

3. A store clerk moved a 4.4 kg box of soap without accleration along a shelf by pushing it with a horizontal force of magnitude 8.1 N. If the employee did 5.9 J of work on the box, how far did the box move.

W=FD

2007-10-21 14:02:39 · 1 answers · asked by Anonymous

Having trouble with these homework problems. Any help would be greatly appreciated!!

Find the parametric equations of the tangent line at the point (-2,2,4) to the curve of intersection of the surface z= 2x^2 -y^2 and the plane z= 4.

Also, another problem that I could not figure out which deals with partial derivitives is:

A package in the shape of a rectangular box can be mailed by U.S Parcel Post if the sum of its length and girth (the perimeter of a cross-section perpendicular to the lengh) is at most 108 in. Find the dimensions of the package with largest volume that can be mailed by Parcel Post.

Thanks for any help again:)

2007-10-21 13:58:36 · 2 answers · asked by JOE 2

Is that so? If not, then could you tell me what exactly sin (-1/2) is equals to ___ degree? I'm confused..thanks!

2007-10-21 13:50:57 · 6 answers · asked by Anonymous

it takes 100joules of work to push a piano across the width of a stage.how wide is the stage , if the force used to push the piano is 5 newtons?

2007-10-21 13:46:43 · 3 answers · asked by :}smile :} 1

2007-10-21 13:43:17 · 5 answers · asked by S 2

Solve for a and b

1. y=3x-5
a)0,? b)3,?
2. 2x-5y=12
a)1,? b)?,4
3. 3x+4y=24
a)4,? b)?,6

2007-10-21 13:35:31 · 9 answers · asked by Scarlet 2

2007-10-21 13:27:23 · 5 answers · asked by Anonymous

2007-10-21 13:26:17 · 7 answers · asked by Amy H 1

2007-10-21 13:25:45 · 1 answers · asked by Anonymous

2007-10-21 13:15:51 · 4 answers · asked by Anonymous

Find the intervals on which f increases and the intervals on which f decreases:

(a). f(x) = x (x + 1) (x + 2)

(b). f(x) = x / (1 + x^2)

(c). f(x) = x + sin x, 0<=x<=2pi

Explain your work. Thanks! :)

2007-10-21 13:13:28 · 1 answers · asked by Anonymous

calculate the derivative of :

i) sin^(-1) squareroot of (1-x)

ii) tan^(-1) squareroot of (x^2 -1)

iii) (x^2 -1)^(1/x)

2007-10-21 13:06:21 · 1 answers · asked by Talal B 1

im failing so if you help i will be so happy.

its y and x axis tables.

x = 2 -1 0 -2 1/2 ___ ___
y = -4 2 0 ___ ___ 6 3

2007-10-21 13:02:03 · 4 answers · asked by Anonymous

I am a student at a high school that uses the Integrated Mathematics Program. I really would like to see actual statistics that show IMP is a better way of learning math than traditional math lessons. I really do not feel that I have learned much and there is no possible way to study out of the textbook. I consider the textbook to be a book full of questions rather an actual learning tool because there are no lessons in the actual book. The only information given about how to solve the problem is given by the teacher and it usually is brief and what is I believe, not much use in real life, unless if I were to figure out the probability of events or finding out how to put a certain problem in summation notation. Most of the students I know do not like IMP and were so glad they had traditional math problems on our PSAT, rather than all word problems. Please show me official statistics that show IMP is a better way to learn IMP, and your own personal opinions.

2007-10-21 13:00:07 · 3 answers · asked by Steve Y 2