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?

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?

Question

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?

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?

anonymous · Answer

modeled by c= 6000/200-2x

anonymous · Answer

start replacing the variable $x$ by the numbers 75, 90, 99

anonymous · Answer

for example, the first one is 
$$C=\frac{6000}{200-2\times 75}=\frac{6000}{200-150}=\frac{6000}{50}=120$$

anonymous · Answer

as for part d
 it is undefined when $x=100$ because $200-2\times 100=0$ and you cannot divide by zero