Mathematics - 3 September 2007

Okay....so...... i really need an answer to this.
I'm a four digit number.
the sum of my digits is 28.
three of my digits are the same.
whether i am rounded to the nearest tens, hundreds, or thousands, i am STILL the same number

2007-09-03 15:38:23 · 7 answers · asked by Cami 2

Please help me solve this problem.
A manufacturer has a monthly fixed cost of $40,000 and a production cost of $9 for each unit produced. The product sells for $16 per unit. If the manufacturer produces and sells 3000 units per month, indicate whether he will have a profit, loss or break-even.

2007-09-03 15:35:39 · 8 answers · asked by susan h 1

ab-a-5a

2007-09-03 15:34:08 · 3 answers · asked by Anonymous

I just want a decent conceptual explanation of the theorems, I've read through some books and received a technical explanation, but my professor doesn't explain things so well imho, so I'm just looking for more of a "dumbed down" explanation. I think I'm starting to get the idea, but I don't quite fully grasp it yet. I'm hoping that your explanations might help me get there. Thanks! :)

2007-09-03 15:24:26 · 1 answers · asked by frostwizrd 2

Hi, does anyone know how to solve this problem? I would really appreciate it because I'm not sure how to do it.

Simplify: 1 / ( √x - √(x+1)

this sign √ is a square root by the way.
A big thanks to anyone who can help!

2007-09-03 14:37:40 · 6 answers · asked by rst41 2

I cannot figure out how to do mixture problems for the life of me. I could really use some help and explanation of how to do them. Thanks!

A bottle contains 750ml of fruit punch with a concentration of 50% pure fruit juice. Jill drinks 100ml of the punch and then refills the bottle with an equal amount of a cheaper brand of punch. If the concentration of juice in the bottle is now reduced to 48%, what was the concentration in the punch that Jill added?

2007-09-03 14:31:58 · 8 answers · asked by keith c 1

2007-09-03 14:18:13 · 3 answers · asked by Anonymous

The density of iron is 7.87 g/mL . What is the mass of a 3.00 cm * 4.00 cm * 1.00 cm block of iron?
Express your answer in grams and show your work.

2007-09-03 14:14:06 · 3 answers · asked by Cindie lou 1

2007-09-03 14:05:59 · 6 answers · asked by Anonymous

How do you do this problem? I usually don't like asking for homework help here, but I just have no idea how to approach this problem since I never learned how to do it.

2007-09-03 14:01:53 · 3 answers · asked by KM 2

2007-09-03 13:50:30 · 4 answers · asked by njtea5 1

#1 (cosx/1-tanx) + (sinx/1-cotx)= sinx+cosx
#2 (cosx/secx-1) - (cosx/tan^2x) = cot^2x

2007-09-03 13:48:52 · 4 answers · asked by Anonymous

2007-09-03 13:35:50 · 1 answers · asked by Chopper 2

can you show step by step

2007-09-03 13:28:49 · 3 answers · asked by janel_nelly1492 1

A.8(x+11)+23
B. 8x - 23 -11
C. 8(x-11) +23
D. 23 + 8x - 11

plz help

2007-09-03 13:27:40 · 25 answers · asked by NONAME 2

u can just show me the method

2007-09-03 13:26:30 · 6 answers · asked by janel_nelly1492 1

You dont have to tell me that answer...you can just tell me what method to use.

2007-09-03 13:21:50 · 2 answers · asked by janel_nelly1492 1

y=2x+1
y-7+ 2/7x
y=9x-3/4

2007-09-03 13:18:21 · 2 answers · asked by Diamond E 1

do they want the answer or just simplafied?

2007-09-03 13:01:40 · 5 answers · asked by carrillo7lucky 1

A backpacker leaves the trailhead on Monday at 9am. and walks a trail arriving at hidden lake at 3pm. his journey may have included rest stops, lunch, a nap, and returning to a stream crsossing where fisheing rods were left after getting a drink. on tuesday, the backpacker leaves hidden lake at 9am. and returns along the same trail. we aren't given the time of arrival at the trailhead. Prove: The backpacker was at some location at the exact same time on both monday and tuesday.

2007-09-03 13:01:04 · 2 answers · asked by tipycleazn 2

There is a big difference between tutoring and doing it for them. These kids will never learn how to do it or pass the exam if you keep doing it for them.

Trust me, your not helping or impressing any one.

2007-09-03 12:52:15 · 6 answers · asked by old hippie 3

Please tell me how you got the answer too

2007-09-03 12:43:43 · 2 answers · asked by Anonymous

Here is the scenario: There is a 6 mile race. Here are the two contestants and their speeds. Who won?

Mary: 3 miles at 6mph and 3 miles at 3mph
Steve: all 6 miles at 4 mph

The answer is that they tie. But the question I am having a hard time explaining is, why can't you figure Mary's overall speed by just taking her average speed (4 1/2 mph)? I know how to work the problem, I am not sure how to explain why this does not work without just showing an example. Any better explanations?

d=rt so t=d/r
Mary: 3/6+3/3=1 1/2 hr
Steve: 6/4=1 1/2 hr

Why can't you figure Mary is faster by averaging her speed and saying it is r=(6+3)/2=4.5mph and therfore she is faster than Steve?

2007-09-03 12:34:06 · 5 answers · asked by Anonymous

That is what I am trying to do, right now. But I am already beginning to struggle, and I just want to make sure that I can do this class if possible without ever having a background in Calculus.

2007-09-03 12:27:35 · 10 answers · asked by Emily 1

Solve and check the following systems by graphing. Show steps. Write equations and points plotted on graph

1.(x – y = 2 )
(x + y = -4)


2.(x + 3y = 6)
(x + 3y = -3)


3.( y = -2x)
(y – 3x = 0 )

For each of the following problems, (a) choose a variable and indicate what it represents, (b) set up a system of equations to represent the problem described, (c) solve the equations

10.Find two numbers whose sum is 131 such that one number is 5 less than three times the other number.

11.Cynthia has 30 coins, consisting of dimes and quarters that total $5.10. How many coins of each kind does she have?

I have no idea how to do this. THANKS FOR ANY HELP!!!

2007-09-03 12:19:55 · 2 answers · asked by crackr 3

1. a rectangle's length is 2ft less than 3 times the width. if the perimeter is 44ft what is it's length ?

2. square root of x^5

3. Add square root of 75x^2 + square root of 12x^2

4. for f(x)=3x+2

5. Factor 3x^3-6x^2

6. factor x^3 +3x^2 +2x

please help and show the work on how you got the answers

2007-09-03 12:04:59 · 3 answers · asked by suferchick 2

Hi! I have a trigonometry question that has been driving me crazy because I can't figure it out! I've tried for nearly 3 hours to no avail! The problem says:

In the figure, angle B is a right angle and the line segment AD bisects angle A. If AB = 10 and BD = 2, find the exact value of CD.

Now I know that this has to do with half angle/double angle identities, but I'm not sure what else to do at this point. I drew the figure on my Paint program on the computer and I uploaded it to photobucket so you can get a visual of what it looks like from my math book. :)

Anyway, I've tried EVERYTHING!!! But I still can't get it! I would copy over all my work here so you can see what I did and where I went wrong, but it took up 17 pages of paper, so that would be too much for me to transcribe. Can you PLEASE PLEASE PLEASE help with this?!?! I'm desperate! Thank you so much!

Here's the link to my drawing:

http://i223.photobucket.com/albums/dd205/OkayThanksToYou/trigproblem.jpg

2007-09-03 11:52:44 · 6 answers · asked by Anonymous

2007-09-03 11:47:32 · 2 answers · asked by josh.isaiah 2

I was not sure if this is trick question.
answers are
1) 18.2
2)54.6
3)670
4)6030

i think this is a trick question. I know it could be 18.2 inches cubed or 6030 inches. So i don't know which would be the correct answer, if you could please explain thanks!

2007-09-03 11:43:21 · 3 answers · asked by ccutestuff2001 2

2007-09-03 11:31:11 · 13 answers · asked by {♥}ChElSeA{♥} 4