for d, when is the denominator zero?
I will be happy to critique your thinking on this. I am uncertain what you are stuck on.
1. The cost, in millions of dollars, to remove x % of pollution in a lake modeled by C= 3,000/300-3x.
Please note: x is in percent, not decimal form.
a. What is the cost to remove 75% of the pollutant?
b. What is the cost to remove 90% of the pollutant?
c. What is the cost to remove 99% of the pollutant?
d. For what value is this equation undefined?
e. Do the answers to sections a. through d. match your expectations? Explain why or why not.
2 answers
a. C = 3000 / (300 - 3x),
C = 3000 / (300 - 3*75),
C = 3000 / (300 - 225),
C = 3000 / 75 = 40M.
b. Same procedure as a.
c. Same procedure as a.
d. The Eq is undefined when the denominator equals 0:
300 - 3x = 0,
3x = 300,
X = 100%.
So the Eq is undefined when X = 100%.
C = 3000 / (300 - 3*75),
C = 3000 / (300 - 225),
C = 3000 / 75 = 40M.
b. Same procedure as a.
c. Same procedure as a.
d. The Eq is undefined when the denominator equals 0:
300 - 3x = 0,
3x = 300,
X = 100%.
So the Eq is undefined when X = 100%.