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3 D 10671

x+2
x-3

18. Discuss the continuity of the function f (x)= on-—2
-2
19. The Gross Domestic Product (GDP) of a certain country was N (t)= t? + 5t +106 billion dollars t
years after 1998 :
(a) At what rate was the GDP changing with respect to time in 2008.
(b) At what percentage rate was the GDP changing with respect to time in 2008.
(5 x 5 = 25 marks)
Section C
Answer any one question.
The question carries 11 marks.
20. Graph the function f (x) =- x? +x +2. Include all x andy intercepts.
21. A manufacturer’s total cost consists of a fixed overhead of $200 plus production cost of $50 per
unit. Explore the total cost as a function of the number of units produced and draw graph.

(1 x 11 = 11 marks)

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