Mathematics - 21 November 2007

-2/5 + ( X+4 / X ) = 1

2007-11-21 08:41:43 · 6 answers · asked by D*Star 1

The length of a shadow of a building is 60 ft when the sun is 66° above the horizon. Find the height of the building. Round your answer to the nearest hundredth.

thanks

2007-11-21 08:41:05 · 4 answers · asked by shauna s 1

6x-4y=8
9x+5y=23
and
4x+3y=78
9x+20y=96

2007-11-21 08:12:01 · 5 answers · asked by Kelly C 1

2007-11-21 08:05:46 · 7 answers · asked by Anonymous

(2X / X+3) + (3 / X-3) = 8 / X^2 -9

2007-11-21 08:05:34 · 5 answers · asked by D*Star 1

2007-11-21 08:00:05 · 9 answers · asked by smileyD 1

2007-11-21 07:54:17 · 17 answers · asked by ljhyatt 1

Find the values of x and y that solve the following system of equations:

- 8x - 3y = 14
- 3x - 7y = 17

Thanks!

2007-11-21 07:49:48 · 3 answers · asked by shauna s 1

please help!!!

6=9-(4x-11) x=???

2007-11-21 07:43:18 · 9 answers · asked by Anonymous

r(t) = (1+t)i + (t^2 -2t)j

2007-11-21 07:38:11 · 3 answers · asked by Anonymous

Ive been trying forever and I cant get the answer. If anyone knows how to work this out, please feel free to help out. Also, Please explain how you did it so can understand how to do it. Thanks!

If Jack and Jill each flip a coin three times, what is the probability they will get the same number of heads?

2007-11-21 07:37:58 · 3 answers · asked by Richard 1

2007-11-21 07:34:00 · 5 answers · asked by D*Star 1

how do i prove this
2 cos^2 A - 1 = cos(2A)


using complex numbers where
cos A = ( e^-iA + e^iA ) / 2

and

sin A = ( e^iA - e^-iA ) / 2i


plz help

2007-11-21 07:33:54 · 2 answers · asked by leyzeebum 1

In celebration of my reaching level 5 (for mostly math answers), i thought I'd post this fun word problem to challenge everyone:
Can you solve for each letter. Each letter has a different value (0 through 9). All of the same letter (IE all "R" letters) have the same numeric value.

. C R O S S <-- the dot is to try make the lines straight
+ R O A D S
-----------------
D A N G E R

Yahoo answers formatting is a little quirky, so working backwards the single units are S, S R, the "tens" units are S, D, E, the hundreds units are O, A, G, .. etc etc

2007-11-21 07:32:54 · 2 answers · asked by David F 5

what are the real and imaginary part of ie^(i theta)??

2007-11-21 07:26:25 · 5 answers · asked by leyzeebum 1

2007-11-21 07:18:13 · 32 answers · asked by aubrey 1

a valuable collection of coins contained old nickels, dimes, quarters, and pennies. The face value of the pennies was $8. There were seven more than three times as many quarters as dimes and sixteen less than twice as many nickels as quarters. If the face value of the entire collection was $38.40, how many of each kind of coin was there?

2007-11-21 07:11:42 · 4 answers · asked by Anonymous

Consider the following 3*3 matrix

2 2+i 0
a 4 2i
b c 6

Find values of a,b and c if the matrix is:
(i) Hermitian
(ii) Skew Hermitian

2007-11-21 07:09:59 · 1 answers · asked by nivik 3

2007-11-21 06:58:14 · 5 answers · asked by Dicky 1

what is:
(2+2+2+2*6-7*88/6+55.81*56)8

2007-11-21 06:56:00 · 6 answers · asked by Anonymous

Six equations are listed below.

A. 2x - 2y = 10 B. -2x - 6y = -8 C. 2x + 6y = 8
D. x + 3y = 4 E. x - y = 5 F. -x + y = 4

Using only these equations, write the pairs of equations that form systems with:
a) no solution
A. 2x - 2y = 10
E. x - y = 5

b) one solution
B. -2x - 6y = -8
F. -x + y = 4

c) infinitely many solutions
C. 2x + 6y = 8
D. x + 3y = 4

Did I do this correctly?

2007-11-21 06:44:53 · 2 answers · asked by Madera 2

2007-11-21 06:42:34 · 4 answers · asked by Anonymous

Explain how you think the function got its name. I've graphed this function, but I can't word it how I want to word it... =\

f(x) = ROUND(x) = {...
1, if 0.5 is *less than or equal to* x <1.5
2, if 1.5 is *less than or equal to* x < 2.5
3, if 2.5 is *less than or equal to* x < 3.5
...}


All help is, of course, appreciated!
Thank you!

2007-11-21 06:41:01 · 1 answers · asked by Anonymous

if (ends < start)then
start = 24 - start
hoursWorked = start + ends
else
hoursWorked = ({Incident.ShiftEndTime} - {Incident.ShiftStartTime})
hoursWorked = hoursWorked / 100
end if

2007-11-21 06:39:22 · 3 answers · asked by Blaine W 2

2007-11-21 06:21:34 · 3 answers · asked by (ƸӜƷ) 1

Find the volume of a triangular prism whose base is regular with sides that measure 12cm and whose height is 10cm.

2007-11-21 05:29:32 · 5 answers · asked by Adrienne W 1

use teh ac test to determine if trinomial is factored.

x^2+2x-15

2007-11-21 05:27:42 · 2 answers · asked by God Bless America!~ 4

If the third and fourth terms of an arithmetic progression are increased by 2 and 7 respectively, then the first four terms form a geometric progression. Which term of the arithmetic progression is 2008?

How do you do this?

2007-11-21 05:22:21 · 1 answers · asked by Anonymous

solve x^2 = 15
solve x^2 + 9 = 18
I cannot figure these out

2007-11-21 05:07:23 · 4 answers · asked by pualla walla 1

If I want to invest a certain amount of money at 8% simple interest, how long will it take for the money to double?

a. 10 years
b. 9 years
c. 11 years
d. 12.5 years

2007-11-21 04:46:58 · 5 answers · asked by jewel7962002 1