Question

1. The cost, in millions of dollars, to remove x % of pollution in a lake modeled by 6,000
C = ______
200 -2x
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.

Answer 1

The 600 is supposed to be over the 200 -2x

Answer 2

d is easy, it is undefined when the denominator (bottom) = 0, so when x=100

Answer 3

so, is this just simple substitution? as in a) C=600/200-2(.75) solve for C?