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November 14th, 2007, 12:18 PM   #1
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Help? Percent of Change!

I know I should know this at my age, but I am REALLY bad with Algebra. I am learning about percents and proportions, and I REALLY need to pass this next test, or I go to a continuation school. Help anybody?
Verridith is offline  
November 15th, 2007, 06:55 PM   #2
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Change = new value minus old value.

Fractional change = change divided by old value.

Example: new value 19, old value 20. Change is -1. Fractional change is -1/20.

100% means 1. Multiplying by 1 leaves a value the same. Hence the fractional change can be multiplied by 100%. Result: fractional change of -1/20 is the same as a change of -(1/20) × 100%, i.e., a change of -5%. When the percent sign is used, you can assume "change" is fractional change, expressed as a percentage.

You need a suitable texbook; do you have one already?
skipjack is offline  
November 27th, 2007, 12:35 PM   #3
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Well, I have a textbook, but the examples aren't that good. The textbook that I use is Algebra concepts and Applications, and SOME of the examples are REALLY good, but others just DON'T cut it.

Thank you!

Do you know of any textbooks that would be better for me to refer to? Or any other math help sites? But I do NOT have that much money, so I can't buy a tutor site sub.
Verridith is offline  
November 29th, 2007, 04:07 AM   #4
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I can probaly walk you through a problem or two if you show exactly what types of problems you need to solve... i forget what everything is called, its been awile.
Quasi Monomial is offline  

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