Marah

I need some help setting up some math word problems (application problems). I am not looking for the answer to the solution, I am sure I can figure it out. I am more stuck on how to make them into systems of equations. Any help or explanations are appreciated. Thank you!

1.A chemist has two solutions, one has 20% concentration and the other is a 45% concentration. How many liters of each must she mix to obtain 10 liters of 30% concentration?

2. Ace electronics, Hi-Fi Stereo, and CD WORLD buy a total of 175 VCR/DVD players from the same distributor each month. Because CD WORLD buys 25 more units than the other two stores combined, CDW's cost is only $160 per unit. THe players cost Hi-Fi $165 each and Ace $170 each. How many plays does each retailer buy each month if the distributor receives $28,500 each month from the sale of the players to the three stores?

http://img213.imageshack.us/img213/9158/1help.png

I can't figure out how to set the problems up and how to continue from there. I'm not interested in the answers (I already have them), but what do do for these?

Thanks!

Alvin paddeled for 5 hours with a 4-km/h current to reach a campsite. The return trip against the same current took 9 hours. What is the speed of the boat in still water?

An investment of 130,000 is made by a business club. The investment is split in three parts and it lasted for one year. The first part of the investment earned .8%, the second .6% and the third .9%. Total interest from the investment was $9540. The interest was 2 times the intrest from the second. Find all three amounts of the investment.

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I know how to set up the sytem from there. I have:

130,000=x+y+z

9540=.08x+.06y+.09z

x = 2y

On the second equation, I times all of the terms by 100 so that I got rid of the decimals. So now I have:

130,000=x+y+z

954000=8x+6y+9z

x = 2y

I know you're supposed to solve it and what not, but I guess what I am asking is how do you do it? Do you plug in x =2y for both of first and second equations and figure it out from there? Or do you eliminate the z's and then solve?

I'm asking because I keep getting decimals and my math professor told me that I should not have any decimals or fractions.

Solving this with how you did would be very helpful. Thank you!

I was told that the Lovely Bones was literary Fiction. What makes it different than commercial fiction?

When I turn slightly left, i do not hear it, but I hear it all the time otherwise. My car is a '00 chevy blazer. The sound reminds me of the humming you would hear from the engine on an airplane...

My teacher assigned a lot of word problems for homework due soon, and I am having a hard time figuring out how to do them.

There's different sections and I pulled some from random sections. If anyone could explain how to do any of them, that would be appreciated!

Thanks!

- Peter can build a deck in 10 hours. Paul can build a deck in 12 hours. How long would it take Peter and Paul working together to build a deck while Mary watches?

- A boat can move at a speed of 5 km/h in still water. The boat travels 42 km downstream in the same time it takes to travel 12 km up stream. What is the speed of the stream?

- y varies inversely as the square of x, and y =6 when x = 3. Find y when x =2 ( ME : Is y = 4?)

- What is the minimum product of 2 numbers whose difference is 14? What are the numbers that give this product?

We were talking about this in class today, and I was just curious as to what other people would say. Serious answers, please.

Thanks!

We have to do a paper on this, and I was just curious what other people would write about.

It can be anything.

Thanks. :)

Fluent speakers please. I'm thinking this will be my next tattoo...

Thanks. (:

A friend of mine recently got a lyric tattoo and soon after another friend got it. I think it's interesting to see what lyrics that people want on them FOREVER.

I'm not sure what I'd put. What would you?

My temperature gage keeps fluctuating rapidly. It will go say that my car is overheating and then quickly go back to the middle of the gage and then it will fluctuate between cold and get close final notch on the H and go back.

I live in Alaska and temperatures around this time are from 10 degrees (F) to about 41 degrees (F).

I also am past due for an oil change, could that be something that could be effecting it?

And what does it sound like is the problem?

We barely went over functions today in class, and I know how to do them for the most part, except when the problems are like this:

The initial functions:

f (x) = 2x + 4

g (x) = -3x +5

And then I get problems like this and get stuck:

1. 3f(x)

2. 3[f(x)]^2

The work shown would be much appreciated. There are many problems like both of those on the paper, I would just like to see how to work them out so I can figure out the rest.

Thanks!

I've been trying to figure this out for awhile, I was sick the last few days of school and have no idea how to do this.

x^2 + y^2 - 10y = 11

I'm thinking it's a circle, but how do you graph the equation with the -10y there? How do you solve it so that it's graphable?

I drank a 32 oz. coke right before I got the call from my employer, asking if I could go in today to get a drug test. I don't have time later, so leaving within the next few hours is a must. I had water before I left.

Last time, I drank too much water, and the urine was diluted, so I have to go in again.

Did I drink too much?

I really don't want to have to do this again.

Can you help explain them and possibly give me answers so I can at least check my work? I have no idea what I'm doing.

5. Some insects survive cold winters by generating an antifreeze inside their cells. The antifreeze produced is glycerol, C3H5(OH)3 a nonvolatile non electrolyte that is quite soluble in water. What must the molality of a glycerol solution be to lower the freezing point of water to -25 degrees Celcius?

6. How many grams of methanol, CH3OH, should be added to 200.g of acetic acid to lower its freezing point by 1.30 degrees Celcius.

7 The boiling point of a solution of glucose, C6H12O6, and water was recorded to be 100.34 degrees Celcius. Calculate the molality of this solution.

I just bought the Sims 2 and played a family. I started out one Caucasian woman and one Caucasian man and made them have a baby. Both were blonde, but one had blue eyes and one had green. Anyway, they had twins and the babies were born (again both with blonde hair and one with blue eyes and one with green) and then at their birthday they turned asian with brown eyes?

Is there a boolprop cheat to fix that or is it a glitch?

Can I fix it?

Also, I can't find my game access code...where would it be in the Sims 2: Double Deluxe Edition?

When did homosexual couples start wanting to push marriage and/or civil unions?

I am writing an essay (a Modest Proposal, if you want the specifics) for my english class and want to see what other people would like to happen to those annoying people who never shut at the theater.

Best answer is for the person with the most creative or most hilarious/satirical suggestion!

Stewie is apparently at airport security and some guy tries to get through and Stewie 'randomly' tags him for additional security. I can't remember what the guy says to him after, but its something like, "Bing Bing Sala Zing".

If someone could find the quote or a link with the episode that would be great! Thanks!