Question 243219: Good afternoon. Could you please help me solve this strange percentage equation question from my Algebra II class?
Creating expressions and equations-
The cost in millions of dollars, to remove x% of pollution in a lake modeled by
a. what is the cost to remove 75% of the pollution?
There is a list of different percentages after this but if someone could just help me understand what exaclty I should be creating then I will gladly do this on my own. Would this be an expression since limited information was given? I will be searching the answers until someone can help me. Thank you so much.
Answer by oberobic(2304)   (Show Source):
You can put this solution on YOUR website! You need to provide more information. For example, what is the cost to remove 1% of the pollution? Then simply multiply by 75 to get the cost to remove 75%.
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Since you say you have a series of percentages, I assume you have costs associated with each of these.
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Plot these values to see if a straight line will fit.
If so, derive the equation of the line and plug in 75% to get the expected cost.
Note that .75 is the slope of the line = m.
y = mx + b,
where y = total cost.
b would be some constant that is present in all cases.
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If there is a single curve, then you have have to create a quadratic equation to solve it.
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But in any case, we need more info to be able to help more.
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