Mathematics - 24 August 2007

2007-08-24 05:49:06 · 7 answers · asked by Anonymous

How would you factor the following?

xˆ2 - 4x - 12????

2007-08-24 05:48:47 · 17 answers · asked by Anonymous

{2x + 4y = -1}
{3x + y = 1}

2007-08-24 05:43:30 · 7 answers · asked by Anonymous

Show your work and expain if you can

Thanks

2007-08-24 05:41:49 · 5 answers · asked by Doug 1

2007-08-24 05:41:44 · 3 answers · asked by Anonymous

(f(a + h) - f (a)) / h?

Show work and describe if you can.

2007-08-24 05:39:34 · 5 answers · asked by Doug 1

An AED 1000, 14% bond with semi-annual coupons redeemable at par on April 11, 2016 is purchased on October 11, 2004 to yield 9% semi-annual interest.

How many coupons are left on this bond?

The answer i got is 25
coz i multiplied: 12.5 *2 = 25 << the number of coupons..
what would the right answer be?

2007-08-24 05:30:49 · 3 answers · asked by Yuuji 1

How would you factor this problem:

18x(to the third power) y + 12xy

2007-08-24 05:27:19 · 5 answers · asked by Anonymous

51478963, 51478523, 50809268, 44907545, 52148317, and i'm not talking about length.

2007-08-24 05:25:25 · 3 answers · asked by bspain0 2

The last problem in my summer math packet was made for a genius so if you r one please show me how to solve it. thanks

(3(n+1)!)/(5n!)

2007-08-24 05:22:34 · 3 answers · asked by adamb417 2

Given Quadrilateral ABCD and the points A(-2, 6), B(4, 6), C(4, -3) and D(-2, -3). Use the distance formula to find the lengths of each side. Give the most specific name for this polygon. Show all your work.

2007-08-24 04:49:40 · 4 answers · asked by Anonymous

i like cheese

2007-08-24 04:44:43 · 8 answers · asked by capiche77 1

http://i40.photobucket.com/albums/e215/xxs3xp1stolxx/Picture7.png

2007-08-24 04:40:05 · 1 answers · asked by ryan s 1

A trapezoid has one pair of parallel sides.

Always

Sometimes

Never

2007-08-24 04:38:37 · 7 answers · asked by ryan s 1

Given rectangle WXYZ. If WX = 10y - 4 and YZ = 13y - 7, find the value of y.

1

3

3.3

6

2007-08-24 04:36:05 · 1 answers · asked by Anonymous

The Cactus Railway runs east and west. Dry Gulch is situated exactly 30 miles south of mile marker 70. Seco City is situated exactly 20 miles south of mile marker 190.
Where should a train station be built so that the sum of the distances to the two towns to the station is mimimum ?

2007-08-24 04:34:44 · 2 answers · asked by William B 4

http://i40.photobucket.com/albums/e215/xxs3xp1stolxx/Picture1.png

2007-08-24 04:29:58 · 3 answers · asked by Anonymous

I am absolutely stumped regarding this questions. Could someone please assist me? I would be extremely grateful.

A runner is jogging at a steady v = 8.4 km/hr. When the runner is L = 4.9 km from the finish line, a bird begins flying from the runner to the finish line at V = 16.8 km/hr (2 times as fast as the runner). When the bird reaches the finish line, it turns around and flies back to the runner. We will assume that the bird occupies only one point in space, ie., a zero length bird.

How far does the bird travel? Answer in units of km.

ALSO:

After this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. The bird repeats the back and forth trips until the runner reaches the finish line.

How far does the bird travel from the beginning? (ie include the distance traveled to the first encounter) Answer in units of km.

2007-08-24 03:55:28 · 4 answers · asked by sg88 1

Hey.

I need some help on the volume of a Cylinder. Let's say that the height is 1.1m and the diamter is 90cm. In my mathematics book the answer is 0.70cm3.

If i were in an examination and i the exact question could i put the answer down as 70cm3? Or does it have to be exactly 0.70cm3? By the way could someone be kind enough to tell me how to get 0.70cm3? What do i round off?

Thanks.

2007-08-24 03:48:41 · 12 answers · asked by Jay Garrick 1

Josephine works part-time in a local video store. Her salary varies directly as the number of hours worked. Last week she earned $43.20 for working 8 hours. This week she earned $118.80. How many hours did she work this week?

2007-08-24 03:32:26 · 6 answers · asked by too_b2000 1

I'm having trouble solving my last question on my summer assignment:

Derive sin2x + cos2x = 1

with only using

cos(x + y) = (cosx)(cosy) - (sinx)(siny)
sin(-x) = -sinx
cos(-x) = cosx
cos0 = 1

Please explain how to solve the problem. Thank You.

2007-08-24 03:30:01 · 4 answers · asked by senseless.student 1

I have to solve this quadratic equation by completing the square. This is as far as I have gotten.

2x^2 +10x + 11=0
2x^2 + 10x = -11
2x^2/2 + 10x/2 = -11/2
x^2 + 5x = -11/2
x^2 + 5x + 1 = -11/2 + 1
(x + )^2 = sqrt -9/2~this is where I am stuck.
I don't know what else to do after this...can some one help me out?

2007-08-24 03:21:41 · 5 answers · asked by jrseeg1rl 2

Mary has just purchased a car for AED 124,000. She paid 50% as a down payment and borrowed the remainder from the bank at a discount rate of 12% compounded monthly over 20 months.

1. How much does Maryam pay the bank each month? 3435.75

2. How much is her last payment? 3435.16

3. How much is paid in total for the car? 130714.41

4. How much of that is interest? 6714.41

I only figured out how to get the first one... the others, i dont.. so i need some help on it ^^!

2007-08-24 03:19:48 · 3 answers · asked by Yuuji 1

Solve by the quadratic formula.

4k^2 +2k +5 = 0

You can use complex numbers. i = rt-1

2007-08-24 03:03:58 · 2 answers · asked by Anonymous

Can i take exp(y) = exp(x(x+2)^-2) and find

exp(y)y' = -2x(x+2)^-3
y' = -2x / (x+2)^2

is there something wrong here?

2007-08-24 02:51:50 · 3 answers · asked by couermort22 1

You are given the four points in the plane A=(-6,-8) B= (-2,1) C=(3,-7) and D=(8,8)
The graph of the function f(x) consists of the three line segments AB, BC and CD. Find the integral f(x) dx by interpreting the integral in terms of sums and/or differences of areas of elementary figures.

integral 8(top) -6 (bottom) f(x) dx=??

I found the x intercepts to be -11/8 and 16/3
I can't seem to get the right answer though.

2007-08-24 02:50:14 · 2 answers · asked by Anonymous

A)

x y
0 0
1 1
2 0
3 1
4 0

B)

x y
0 0
1 1
2 -2
3 3
4 -4

C)
x y
0 0
1 1
2 4
3 9
4 16

D)

x y
0 1
2 3
4 5
6 7
8 9


I think its C, but not sure!

2007-08-24 02:44:21 · 2 answers · asked by Mari 1

OK, my uncle and I have had these weird debates of why algebra is important...he says it is useless and just waists our time in school...he says its not nescesary at all in life, he thinks it should be banished from being taught. I think on the contrary.

So why are the below topics important...what can they be used for...because it would be useless if u couldn't apply it to anything in life (making equations etc)

inequalities

functions

linear equations (elimination, substitution methods and Cramers Rule)
Completing the Square
Quadratic formula and quadratic functions
exponents
(basically all the topics covered in my Algebra II class-there was more)

2007-08-24 02:35:14 · 15 answers · asked by JUST ME 1

Please don't use parabola general formula.

2007-08-24 02:16:17 · 3 answers · asked by monkey 2

2007-08-24 02:15:54 · 7 answers · asked by Anonymous