Question 5 4(10000 - x2) [5 marks The cost, in billions of dollars, of cleaning up % of an oil spill is C() = 250x + 15000 (E.g. C(50) is the cost of cleaning up 50% of the oil spill.) a. How much does it cost to clean up 70% of the spill? b. Use algebra to determine lim C(@). Interpret your result. T $100