Science & Mathematics - 14 November 2007

The problem says "You like to drive to a special store to buy your favorite gourmet jelly beans for a low price of $1.30 a pound. However, your best friend points out that you are spending about $3 on gas every time you drive to that store and that you might as well buy your jelly beans at your local supermarket for $2.10 a pound. You decided to show him that you are getting enough jelly beans to make it worth the trip.

The first question (part A) asks me to let X represent the number of pounds of jelly beans and to write an equation to determine the total cost, C, if I buy them at the special store. I wrote:

C=1.30X+3

Then (part B) it asks me to write an equation to determine the total cost, C, if I buy the jelly beans at the local supermarket. I wrote:

C=2.10X

Those are both right

But this is where I get stuck….

It says “The two equations in part A and part B form a system of two linear equations. Solve this system using an algebraic approach.”

I don’t know how to do this!!

2007-11-14 12:52:52 · 2 answers · asked by Anonymous in Mathematics

2007-11-14 12:52:36 · 1 answers · asked by Anonymous in Mathematics

Use the Equipartition Theorem to help answer this.

2007-11-14 12:52:09 · 10 answers · asked by laudie3a 2 in Physics

I have a chemistry project for school and it is designing a half dollar coin out of any materials we like. We have copper pennies, so i was thinking about a copper half dollar. Is copper a good metal to use for it? Are there any special properties of copper that make it a good metal? Are there any special properties that make it a bad metal? Thanks in advance.

2007-11-14 12:52:04 · 3 answers · asked by Kumar 4 in Chemistry

1. Identify the most important interparticle forces in each substance

AlCl3
CH3(CH2)nCH2OH
CCl4
Si
NO
NO2

2007-11-14 12:51:05 · 1 answers · asked by Riley 1 in Chemistry

Don't calculate it here, merely explain what you need to do in order to calculate it. Give the strategy, not the result.

2007-11-14 12:50:33 · 2 answers · asked by laudie3a 2 in Physics

I drink a cup of milk practically every day in hope of becoming taller, my sister and brother are tallish but I have another brother who is like 5''3. Is drinking milk going to help at all??? If not what will, I'm not interested in getting shots to postpone my period or make me grow.....

Thanx!

2007-11-14 12:50:11 · 2 answers · asked by heyyyyy 3 in Biology

2007-11-14 12:48:07 · 2 answers · asked by APNA 3 in Chemistry

The question goes as follows:
Standard cell potentials are determined with 1.0 M solutions of ions. In this experiment, we will use 0.10 M solutions of Zn2+, Cu2+, Pb2+, and Ag1+ to minimize the amount of hazardous waste generated. In this series of questions, you will figure out what effect this will have on the voltages you observe.

Consider a cell consisting of a Cu2+/Cu couple, and a Ni2+/Ni couple.

a. Starting with 1.0 M solutions of ions (standard conditions), evaluate Q in the Nerst Equation.

OK, so, Q=[products]^coeff/[reactancts]^coeff. I'm figured out th equation to be 2Cu^2+ + Ni<---> Ni^2+ + 2Cu^1+. The Q equation would be= [Ni]/[Cu^2+]^2, right? but I have no idea how to get the Molarities!! Is Cu^2+ 0.1M??? What's Ni?? PLease help!

2007-11-14 12:46:42 · 2 answers · asked by flaquita 1 in Chemistry

Why do asteroids never pu on a show like comets?

2007-11-14 12:46:34 · 1 answers · asked by Kath 1 in Astronomy & Space

2007-11-14 12:46:32 · 2 answers · asked by shy one 2 in Mathematics

What is the right way to taste a specimen of halite, (or an unknown mineral that is similar to halite)?

2007-11-14 12:40:53 · 2 answers · asked by Mz. Tr3ma1n3 N3v3rs0n 585 2 in Earth Sciences & Geology

Hi,

A line in the infrared region of hydrogen spectrum has wavelength of 1.093 micrometers. What is the transition responsible for this wavelength?

I tried using (9.112E-8 m) / (wavelength) = (1/nf^2 - 1/ni^2). But how do I solve for two unknowns? Do I assume nf = 1?


Thanks!

2007-11-14 12:40:02 · 1 answers · asked by Anonymous in Chemistry

2007-11-14 12:38:51 · 5 answers · asked by Anonymous in Mathematics

38% of what # is 28?
52 is what %of 78?
I only need answer I just have to check before teaching someone

2007-11-14 12:38:23 · 6 answers · asked by donthitmeah 2 in Mathematics

2007-11-14 12:34:53 · 3 answers · asked by xzoticgreeneyez 1 in Chemistry

Sometimes when I walk though automatic doors like at a supermarket they jam up. Fot a while it happened every time, its very annoying cuz you think its going to close on you or something.
They usually jam open and the motors are still running and buzzing. Alot of the time the sensors dont pick me up when I'm going to them either... I am short but kids go through these doors everyday with no trouble. so why dont they like me lol

2007-11-14 12:33:13 · 6 answers · asked by Shayde 3 in Other - Alternative

In high school, a buddy of mine built a rail gun, or EMP cannon. He was able to project anything he could fit inside at super high velocities using the magnetic fields it created. Apparently the "projectile" had a magnetic field that was only disrupted by contact with a solid. With that in mind, couldnt we build a big one, stick a ship inside, and launch it into space? All it would need besides what a shuttle has is a secondary electromagnetic pulse to cancel out the magnetic field, and allow the ship to move freely. This could even be done deep into the solar system to save the fuel on the initial trip. People already know how to do this.

2007-11-14 12:29:14 · 7 answers · asked by suicidecash 1 in Astronomy & Space

2007-11-14 12:29:09 · 5 answers · asked by Anonymous in Engineering

Can you get addicted to exctasy pills?

2007-11-14 12:26:35 · 2 answers · asked by aimeex16 1 in Medicine

2007-11-14 12:25:07 · 6 answers · asked by Shayla K 1 in Astronomy & Space

whats the time difference between california and new york?

2007-11-14 12:24:57 · 4 answers · asked by Kaitlyn M 1 in Geography

Does anyone know the proof of this theorem:
If line l is parallel to line m, and m is parallel to line n, then l is parallel to n or l is equal to n.

I would LOVE a paragraph proof, but a column proof would also help. Thanks!

2007-11-14 12:24:00 · 1 answers · asked by harrypotteressence 3 in Mathematics

as expected? Do you believe the computers are more to blame or just some people are lousy at forecasting?

2007-11-14 12:23:10 · 3 answers · asked by clusterfuster 1 in Weather

2007-11-14 12:21:07 · 3 answers · asked by Anonymous in Chemistry

2007-11-14 12:17:53 · 7 answers · asked by bigrac15 2 in Mathematics

2007-11-14 12:17:33 · 1 answers · asked by rachel666 1 in Medicine

2007-11-14 12:17:11 · 9 answers · asked by lorddad7 2 in Astronomy & Space

2007-11-14 12:14:44 · 4 answers · asked by krymarbet 1 in Astronomy & Space

Two horizontal forces, 221 N and 186 N, are exerted in opposite directions on a crate. What is the net horizontal force on the create? Be sure to indicate the direction of the net force. (Assume that the 221 N force is in the positive direction.)

2007-11-14 12:14:24 · 4 answers · asked by Anonymous in Physics