# Algebra

posted by .

Did I do this right?

1. 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 pollutant?

I got \$3,022,670,025

• Algebra -

Did you leave out some information?

• Algebra -

Re-check your problem. I think you are missing a part here.

pollution in a lake modeled by ?

• Algebra -

sorry it didn't paste the formula.. lets try again....

1. The cost, in millions of dollars, to remove x % of pollution in a lake modeled by C=6000/(200-2x)

a. What is the cost to remove 75% of the pollutant?

I got \$3,022,670,025

• Algebra -

C = 6000/(200 - 2x)
C = 6000/(200 - 2(75))
C = 6000/(200 - 150)
C = 6000/50
C = 120 mil
120,000,000 million

or, is it

C = 6000/(200 - 2(.75))
C = 6000/(200 - 1.5)
C = 6000/198.5
C = 30.2267 mil
30,226,700 million

I think it's the first, but I am not a tutor

• Algebra -

Thank you.. I too got both those answers.. at least the second answer you got to an extent.. not sure which is correct myself.

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