Mathematics - 25 November 2007

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Thanks!

2007-11-25 09:35:53 · 1 answers · asked by lirael1019 1

2007-11-25 08:59:26 · 1 answers · asked by Anonymous

First, work with the subset {83, 838, 838383 ...}:
Assume that there exists a number x for which x^3 = 8383...83
If x^3 terminates in a 3, then x must terminate in a 7 (--7^3 = 343).
x can be rewritten as (10n+7):
(10n+7)^3 = 8383...83
1000n^3+1400n^2+490n+700n^2+980N+343 = 8383...83
1000n^3+2100n^2+1470n+343 = 8383...83
-subtract 343 on both sides
1000n^3+2100n^2+1470n = 8383...838040
-divide by 10 on both sides
100n^3+210n^2+147n = 8383...83804

Since the value of n must make 100n^3+210n^2+147n a number terminating in 4, and 147n is the only part of the equation that concerned the ones digit, 147n must equal a number terminating in 4. In order for 147n to terminate in a 4, n must terminate in a 2.
Therefore n can be rewritten as (10m+2)
(10(10m+2)+7)^3 = 8383...83
(100m+20+7)^3 = 8383...83
(100m+27)^3 = 8383...83
100000m^3+81000m^2+14310m+4580=8383...8383
-subtract 4580 on both sides
100000m^3+81000m^2+14310m= 8383...833803

2007-11-25 08:58:17 · 1 answers · asked by Man 5

Write the augmented matrix:
3x + 5y = - 13
2x + 3y = - 9
A) | 3 5 | - 13 |
| 2 3 | - 9 |

B) | 2 3 | - 9 |
| 3 5 | - 13 |

C) | - 13| 3 5 |
| - 9| - 2 3 |

D) | 13| 3 5 |
| - 9| 2 3 |

2007-11-25 08:29:09 · 4 answers · asked by Anonymous

Use echelon method to solve x and y in equations:
2x + 7y = - 8
- 2x + 3y = - 12
A) x = 3, y = 2
B) x = - 3, y = 2
C) x = 3, y = - 2
D) x = - 3, y = - 2

2007-11-25 08:27:51 · 3 answers · asked by Anonymous

F(x)=|1+x|/|1-x^2|*times* (x^2-5x+6)(x-1)^3/
(4-x^2)(x+3)(2x+1)^2 <- less than or equal to 0
hope you can kinda of understand the formatting! Any help would be greatly appreciated!

2007-11-25 08:23:36 · 2 answers · asked by ...confused.. 1

Use echelon method to solve x and y in equations:
4x + y = 9
3x – y = 5
A) x = 1, y = 2
B) x = 2, y = 1
C) x = - 2, y = - 1
D) x = - 1, y = 2

2007-11-25 08:22:49 · 4 answers · asked by brandon c 1

1) 40 degrees

2) 25 degrees

3) 69.5

4) m degrees

5) (90-y)

2007-11-25 07:43:45 · 3 answers · asked by blackeye718 1

Solve for x:
1- log2 radical 8 = x
2- (4/3)^x+1=9/16
3- log(2+x)log(x-3)=log14

2007-11-25 07:36:19 · 2 answers · asked by Siempre07 1

Thanks for help

2007-11-25 07:33:32 · 1 answers · asked by Anonymous

I'm doing research on perfect powers of infintie sets and so far all the sets i've used:

{11, 111, 1111...}
{45, 454, 4545, 45454 ...}
{83, 838, 8383, 83838 ...}
don't have perfect square
(didn't do the cube yet)

I need some sort of infinite set (with a pattern like mines) that does have a perfect square/cube that can't be found by inspection, for ex. it is like a huge number or something..

Thanks

2007-11-25 07:17:54 · 1 answers · asked by Man 5

The weight of a cylindrical can of pea soup varies jointly with the height and the square of the radius. If a 4-inch high can with a 1-inch radius weighs 12 ounces, then what is the weight of a 5-inch high can (in ounces) with a radius of 2 inches?

2007-11-25 07:11:09 · 3 answers · asked by Monkey Kick 1

2007-11-25 07:08:43 · 7 answers · asked by mimi 1

lim (x,y) --> (3,2) ((y-2)^2)ln(y-1) / ((x-3)^2)+((y-2)^2)

use any two paths that pass through (3,2) to guess what the limit may be

2007-11-25 06:59:14 · 1 answers · asked by Anonymous

2007-11-25 06:57:58 · 1 answers · asked by Lisa R 2

Adult tickets for a play cost $8 and child tickets cost $6. If there were 25 people at a performance and the theater collected $188 from ticket sales, how many adults and how many children attended the play?
Showing work please

2007-11-25 06:52:53 · 3 answers · asked by Gwen B 1

any links to sites that might help as well?

2007-11-25 06:45:13 · 2 answers · asked by Anonymous

Yi Chen made a $6,400 investment at the beginning of a year.By the end of the year, the value of the investment had decreased by 8.2%.What was value at the end of the year

2007-11-25 06:33:53 · 8 answers · asked by Jessica J 1

i have the numbers for A, B, C, , X-intercept, Y-intercept, standard form, slope-intercept form...A=4, B=-3, C=2, X-intercept=(.5,0),Y-intercept=(0,.66), slope-intercept form=y=4/3x+2/3

2007-11-25 06:30:59 · 2 answers · asked by Shirley H 1

its math

2007-11-25 06:30:37 · 17 answers · asked by Jessica J 1

I was sick and missed class and homework is due tomorrow.

2007-11-25 06:27:56 · 3 answers · asked by Anonymous

how to find the divF and curlF for F(x,y,z)= ln x i+e^(xyz) j+tan^(-1)(z/x) k

i am stick at the derivvative e^(xyz) and tan^(-1)(z/x)

2007-11-25 06:27:32 · 1 answers · asked by Anonymous

1. R-90°
2. R90°
3. ry=x
4. rx-axis

2007-11-25 06:21:32 · 3 answers · asked by Anonymous

It a math promblem and i alway see when im taking my test and i got it wrong again. 2y-6-y-4 ? it is simplify how do u do that plese show how u got the answer also

Another simplify question 4(x-2)-3(2x-6) show answer and how u do it

2007-11-25 06:19:06 · 6 answers · asked by subzero123kid 2

Rewrite the equation 4x – 10y = 11 as a function of x.
Show steps

2007-11-25 06:10:27 · 2 answers · asked by Sara R 1

Find all relative extrema of the function. Use second derivative test if applicable.

f(x) = x/x^2 - 1

2007-11-25 06:05:47 · 1 answers · asked by Anonymous

(log2X)^2 - log2X^2 + 2 =0

2007-11-25 05:58:35 · 3 answers · asked by Anonymous

in the impossible quiz

2007-11-25 05:56:24 · 4 answers · asked by Anonymous

Subtract mixed numbers: Write answer in simplest form.

6 1/5 - 2 2/3=

2007-11-25 05:55:13 · 9 answers · asked by Anonymous

pythagorus i can work out. an irregular triangle how can you work out the lengths of the sides. a sine rule? or cosine rule ? i do not understand these. any help appreciated

2007-11-25 05:47:30 · 5 answers · asked by Anonymous