Mathematics - 24 August 2007

Find the value of a^3 + b^3 + c^3 - 3abc
given that
a+b+c = 10 & a^2 + b^2 + c^2 = 83

2007-08-24 23:39:17 · 7 answers · asked by besst_gal 1

4 sinx cosx=1
find x between 0 degrees to 360 degrees

2007-08-24 23:16:04 · 9 answers · asked by Stormy Knight 1

How do you work out the SD of a total?

2007-08-24 22:58:55 · 4 answers · asked by shy one 2

How do you work out the mean of a total?

2007-08-24 22:58:10 · 13 answers · asked by shy one 2

Determine the are and perimeter of each figure described:

Rectangle with length of 3.6cm and square with sides of lenght 9mm width 4.2cm

Show your work

2007-08-24 22:35:35 · 9 answers · asked by CheeseFace 1

2007-08-24 21:22:00 · 10 answers · asked by abad o 1

prove by induction that :
1+5a(n)*a(n+1) =[a(n) +a(n+1)]^2 +501

2007-08-24 21:12:41 · 3 answers · asked by Anonymous

For x is greater than or equal to -b/2a,
the inverse of the function f(x) = ax^2 + bx + c is the function
g(x) = {-b + the square root of *[(b^2 - 4a(c - x))]*} / 2a
provided that 4ax + b^2 - 4ac is greater than or equal to 0.

2007-08-24 20:48:31 · 2 answers · asked by quizzical 1

Use the second derivative test to identify the relative extrema of f(x) = (x^2 - 6x + 8)^2

2007-08-24 20:41:50 · 3 answers · asked by quizzical 1

2007-08-24 20:31:50 · 2 answers · asked by quizzie 1

3x - y - 2z = 11
x – 2y + 3z = 12
x + y - 2z = 5

2007-08-24 19:40:11 · 5 answers · asked by Splendidy 1

2x – y + z = 8
x + 2y + z = -3
x - 2y – z = 7

2007-08-24 19:38:27 · 3 answers · asked by Splendidy 1

2007-08-24 19:29:22 · 16 answers · asked by funkky 1

Ok, im going to make it up:

pat paints a fence in 2 hours, jill in 3 hours. put them together, how long does it take them for paint one fence.

1 hr and 12 mins, right?

2007-08-24 19:27:03 · 11 answers · asked by Trace 2

The base of the triangle is bisected to create two triangles, one small and one large. The height of the smaller triangle is 15 cm and the height of the larger triangle is 25? The base of the larger triangle is 40 cm. What is the length of the base of the smaller triangle?

2007-08-24 19:22:10 · 2 answers · asked by huskychick88 1

If the given is secθ=3 in Quadrant IV, then what's the cosθ, tanθ, sinθ, and cos(2θ)? Thank you. I appreciated it.

2007-08-24 19:13:26 · 3 answers · asked by Anonymous

FACTOR OUT COMPLETELY

1. a^2 - 8ab + 16b^2 - 25

2. a^2 - b^2 + 8b - 16

***easy 2 points to whoever answers it

2007-08-24 19:07:57 · 2 answers · asked by Anonymous

The surface of a certain plant that requires painting is 8,000 sq.ft Two kinds of paint are available whose brand are A and B. Paint A cost P1.40 per sq. ft. but needs renewal at the end of every 4 years, while paint B cost P1.80 per sq.ft.
Please show me your formula or computation to prove that your answer is correct.. Thanks and God Bless You.

2007-08-24 19:05:47 · 2 answers · asked by JEV# 2

28x^9y^9+8x^6y^5-24x^3y^3

2007-08-24 18:51:46 · 3 answers · asked by carole bostic 1

determine which 2 equations are parallel...please help and show work so i can have a better understanding...thanks.

a. y=3x-5

b. y=4x+5

c. y=1/4x+5

d. y=-4x+9

2007-08-24 18:42:04 · 5 answers · asked by lele 2

2sqrtx+3(x+1)^2-sqrt4x + x^2

2007-08-24 18:30:54 · 1 answers · asked by curly152 1

I've just built the shape by hand, and after folding and every other little odd job that needed to be done it's come out looking like my dog's breakfast.
I was wondering if there was a free computer program out there where I could design it then print it off?

2007-08-24 18:24:02 · 1 answers · asked by Skaggy says: 5

The population of Cedar Rapids is expanding at a rate of
P = Po e^kt,
where Po is the current population, k is the expansion rate and t is time (in years). If the populations were 10,000 in 1990 and 12,000 in 2000, when will it reach 20,000?

2007-08-24 18:21:49 · 2 answers · asked by curly152 1

Each one of these I have to factor. Can anyone help me with this? Thank you

2007-08-24 18:16:49 · 3 answers · asked by carole bostic 1

The equation given is
lg5lg5 + lg5lgx = lg4lg4 + lg4lgx
Find x

Help please >.<

2007-08-24 17:53:24 · 4 answers · asked by Anonymous

im lost. how do i solve this. i dont want just the answer. please, i want to learn, thankyou.

2007-08-24 17:50:56 · 6 answers · asked by iamafreak12345 1

Solve for z:

| 3z - 2 | = | -3z + 3 |

2007-08-24 17:46:17 · 3 answers · asked by plplz 1

A building casts a shadow 23 feet long when the angle of elevation of the sun is 52 degrees. Find the height of the building correct to the nearest integer.

I think I might know the answer. Anyway, Please explain how to do this. THANKS A LOT FOR ANY HELP!

2007-08-24 17:42:55 · 3 answers · asked by acetone33432 1

2007-08-24 17:32:34 · 3 answers · asked by Anonymous

1. A parable that is greater then 0 (opening is up) starting on (3,0) passes through point (4,2). I got x^2-6x+9 is that correct.
2. A parable that le less than zero (opening is down) passes through (-2,2), (0,1), and (1, -2.5) I can not figure out how to find this one out? Some help.

IF 1 is not correct can you please explain how to get the it. Not sure if I am on the right track?

2007-08-24 17:15:56 · 4 answers · asked by m_carl 1