Matrix Applications in Political and Business Settings

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Homework Help Overview

The discussion revolves around problems related to linear systems and matrices, specifically in the context of political and business applications. Participants are exploring how to set up equations based on given scenarios involving registered voters and sales data.

Discussion Character

  • Exploratory, Problem interpretation, Assumption checking

Approaches and Questions Raised

  • Participants are attempting to express the problems mathematically, particularly focusing on creating equations from the provided information. There are discussions about simplifying the information and using ratios to aid in understanding the relationships between variables.

Discussion Status

Some guidance has been offered on how to set up the equations for the first problem, with suggestions to express the information mathematically and consider ratios. However, there is still a request for additional equations to help clarify the setup, indicating that participants are actively seeking further assistance.

Contextual Notes

Participants are working under the constraints of needing to complete their homework assignments, which may limit the amount of direct assistance they can receive. There is an emphasis on understanding the setup rather than receiving complete solutions.

speed02
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here is a word problem if someone can post how to set it up and the answer that would be great because i have to do the work any way. I did like 30 problems already and these are the only ones I am having a problems with.

Problem #1 Its in a Linear systems/matrices chapter
there are 150,000 registered democrats, Republicans, and Indepdents in a country. the number of indep. is 20% of the total number of Demo. and Rep.. In an election, 40% of the Demo. voted, 50% of the Rep., and 70% of the Indep.. The votess totaled 72,000. How many Democrats, Republicans and Independents are registered?

Problem #2 summarize the given information in matrix form
AN appliance saleswomen sold 15 washers, 8 dryers, and 13 microwave ovens in March. She sold 12 washers, 11 dryers and 6 microwave ovens in April.

Problem #3
The health fare cereal Co. makes three cereals using wheat, oats, and raisins. The proportions of each cereal are.

cereal wheat oats Raisins

Lite .75 .25 0
trim .50 .25 .25
Health Fare .25 .50 .25

use matrix Multiplication to determine the number of pounds of wheat, oats, and raisins needed to fill an order of 1480 pounds of Lite, 1840 pounds of Trim and 2050 pounds of health Fare.


Thanx in advance for the help.
 
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Re #1, just express what is given in mathematical terms. Example:

there are 150,000 registered democrats, Republicans, and Indepdents

means D + R + I = 150,000. Keep going from there and you'll likely have 3 equations in 3 unknowns.
 
For your first problem:

I always think that sometimes the question looks so long and wordy that it puts you off. You should think about simplifying the information mathematically first. Assign a letter to each type of voter. Then think about the information you have and try to link it with some simple formulae.

As a further hint, think about ratios. I don't know how much you know about ratios and their mathematical uses, but they seem to be useful here.

EDIT: hotvette, you posted just as I was writing out my post :)
 
can you please post the other two equations because I am just lost trying to set up the problem. Once have the other two equations i would be able to solve it myself. Thanks for your help