The cost, in millions of dollars, to remove x % of pollution in a lake modeled by c= 6000 divided by 200-2x

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

=6000/(200-2*75).

=120.

b. What is the cost to remove 90% of the pollutant?

=6000/(200-2*90).

=300.

c. What is the cost to remove 99% of the pollutant?

=6000/(200-2*99).

=3000.

d. For what value is this equation undefined?

The equation is undefined if denominator 200-2x=0.

that x=200/2 =100%.

For 100% the equation is undefined.