Mathematics - 22 November 2007

x^2 - 2x - 2400 = 0
= x^2 - 2x +1 - 1 -2400
= (x-1)^2 - 2401
correct?

2007-11-22 13:10:45 · 5 answers · asked by Bo 3

0 <= theta < 2pi

Could someone please explain how to solve these? Thanks.

1. sin 2theta sin theta = cos theta

2. cos 2theta + 5 cos theta + 3 = 0

2007-11-22 12:57:55 · 3 answers · asked by labelapark 6

Solve using a matrix:

x - 2y = 6

4x - 3y = 4

2007-11-22 12:57:45 · 4 answers · asked by Anonymous

How many wavelengths per second are in one mega hertz? Or am I completely confused, and mega hertz isn't a unit used to measure this?? If so, what is it?

2007-11-22 12:44:38 · 2 answers · asked by pspkilla 4

the pow is the follow:

Pow 13 - Corey Camel

Consider the case of Corey Camel - the enterprising but eccentric owner of a small banana grove in a remote desert oasis. Corey's harvest, which is worth its weight in gold, consists of 4000 bananas. The marketplace where the harvest can be sold is 1000 miles away. However, Corey must walk to the market, and she can carry at most 1000 bananas at a time. Furthermore, being a camel, Corey eats one banana during each and every mile she walks (so Corey can never walk anywhere without bananas).

The question is this:
How many bananas can Corey get to the market?

2007-11-22 12:42:15 · 3 answers · asked by hect100 1

The teacher leaves the school a little after six p.m. and notices the hands on her watch form a one-hundred ten degree angle. Returning before seven p.m. she again notices that the hands form a one-hundred ten degree angle. How many minutes have elapsed while the teacher was away?

i tried this problem but i dont know how to do it, esp when i remebered that the hour hand moves too! plz show work.

2007-11-22 12:40:35 · 4 answers · asked by Anonymous

2007-11-22 12:35:32 · 2 answers · asked by Anonymous

2007-11-22 12:34:40 · 6 answers · asked by Anonymous

A machine is a rolling a metel cylinder under pressure. The radius of the cylinder is decreasing at a constant rate of 0.05 inches per second and the volume V is 128π cubic inches. At what rate is the length h changing when the radius r is 2.5 inches? [Hint: V = (π)(h)(r^2)]

2007-11-22 12:29:58 · 2 answers · asked by Oscar A 2

The problem can be found here:
http://img229.imageshack.us/img229/3647/q26ry7.jpg

I'm guessing that it is in the second line of the solution. Not sure how would I express this big boy as a single log?

Thanks!

2007-11-22 12:27:07 · 7 answers · asked by ms_lotr_freak 3

A crank 20 cm long, starting at 60 degrees from the horizontal, sweeps out a positive angle at the uniform rate of 10 rad/s.

Determine a function that gives the height of the end of the crank from the horizontal line at any time t.

Someone please help me on this question, but trying to figure it out for a while now.

2007-11-22 12:23:31 · 3 answers · asked by Jack L 2

Two friend and I went to a hotel:

We had to pay $30 for a double room so we each payed $10 (3x10=30)
The owner apparently forgot to mention to the receptionist that this night was on special for $25/night.
The receptionist brought us the five dollar back, we gave him two dollars as a tip out of the five and kept 3 dollars (1 dollar each)

So we now each payed $9 per person (9x3=27) + we gave two dollar back to the receptionist (27+2=29)

What in the world happen to the last dollar?

Happy thanksgiving thinking about that! :-)

2007-11-22 12:20:16 · 5 answers · asked by DRC Frank 5

y=x^2+2x-2
y=3x+4

2007-11-22 12:13:51 · 4 answers · asked by Anonymous

#1,
x/3+4y=30
2x-y=5
#2,
6x-y/4=-9
3x+2y=-30

2007-11-22 12:12:07 · 4 answers · asked by Anonymous

2007-11-22 12:08:44 · 7 answers · asked by Melissa G 1

y=x^2-4
y=x-2

2007-11-22 12:01:35 · 3 answers · asked by michael s 1

0 <= theta < 2pi

Could someone please explain how to solve these problems? Thanks.

1. 4 cos^2 theta - 3 = 0

2. cos^2 theta - sin^2 theta + sin theta = 0

2007-11-22 11:56:26 · 4 answers · asked by labelapark 6

(1/2)(sin x)[(sin x)/(1-cos x) + (1-cos x)/(sin x)] = 1

2007-11-22 11:54:35 · 3 answers · asked by max 2

Tima has reduced his cholesterol level by 20% by dieting and exercising. If his original level was 238, what is his new cholesterol level?

2007-11-22 11:34:02 · 11 answers · asked by Anonymous

1) Two numbers hav a sum of 60. find the numbers if their product is a maxium.

2) A rectangular lot is bordered on one side by a stream and on the other 3 sides by 600m. of fencing, find the dimensions of the lot if its area is a maxium.


THXXX SOOOOO MUCH!!!!!! FOR ANSWERING!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! =]

2007-11-22 11:09:39 · 2 answers · asked by Cresentia S 3

Solve using simultaneous equations:

Flour is sold in packets of 5kg and 2kg. The 5kg packets cost $2.75 each and the 2kg packets cost $1.25 each. If I bought 67kg of flour and the total cost was $38.50, how many of each kind of packet did I buy?

Full working out would be so appreciated :)

2007-11-22 11:06:43 · 4 answers · asked by Anonymous

can someone tell me the hex values to 10
20
30
40
50
60
70
80
90 and
100?

2007-11-22 11:04:26 · 4 answers · asked by Andres 1

A golf company has determined that the daily per unit cost C of manufacturing x additional Big Bertha – type golf clubs may be expressed by the quadratic function

C(x) = 5x^2 – 620x + 20,000

a)How many clubs should be manufactured to minimize the additional cost per club?

b)At this level of production , what is the additional cost per club?

2007-11-22 10:53:35 · 5 answers · asked by Anonymous

Factorize
4y + mx - 4x - my
Please show your steps so I can learn how to do it

2007-11-22 10:42:39 · 11 answers · asked by tobias 2

Show work in ai+ bj form to find the tension in the two cables. This is a static equilibrium problem. The answers are Left Cable: 845 lbs, Right Cable: 1000 lbs.
(THIS IS A TRIGONOMETRY PROBLEM, NOT PHYSICS)
Look at the picture for reference.
http://i2.photobucket.com/albums/y6/VietIronChef/math.jpg

2007-11-22 10:36:20 · 2 answers · asked by Anonymous

2007-11-22 10:20:33 · 7 answers · asked by Anonymous

I'm forgetting some algebra rules; why is this true?

2007-11-22 09:57:18 · 3 answers · asked by RogerDodger 1

When solving for "x" in this equation:
log_2(x) + log_2 (5)=3
I got x=1.6 or 8/5

3^2x=27^2x-3
I got x=9/4

I have no idea if these are right, I'm guessing here.
Thanks.

2007-11-22 09:57:03 · 4 answers · asked by ms_lotr_freak 3

solve the equation

x^2 = 95-168i using complex numbers.

2007-11-22 09:50:36 · 3 answers · asked by Anonymous

i need to know how to find fid the exact answer of SIN (-π/8)

if anyone can give me a step by step action i would be thnakful

2007-11-22 09:46:22 · 3 answers · asked by Anonymous