The cost, C, in United States Dollars ($), of cleaning up x percent of an oil spill along the Gulf Coast of the United States increases tremendously as x approaches 100. One equation for determining the cost (in millions $) is:

Complete Question

On the uploaded image is a similar question that will explain the given question

The value of k is  

The percentage  of the oil that will be cleaned is

Step-by-step explanation:

From the question we are told that

   The  cost of cleaning up the spillage is    

     The  cost of cleaning x =  70% of the oil is  

Now at   we have  

Now  When  

1. d.90

2. e. none of these (80)

3. a. 0

4. b. 6

5. e. none of these (10)

6. a. 5

the answer is y < -3 or   y > 3

-3y > 7 + 2

-3 y > 9

y < -3