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6. An oil tank is being drained for cleaning. After / minutes there are I' litres of oil left in the tank, where V() = 40(20-1) , 0 SS 20. Determine the rate of change of volume at the time / = 10. a. -800 litres/minute c. -400 litres/minute b. -600 litres/minute d. -200 litres/minute 7. Determine lim 3x + x3. * + - 2 a. 10 C. b. -2 d. -4 8. Determine lim 5. x+ 4 a. c. 5 b. -4 d. -5 9. Which of the following must be equal to lim (x) so that the limit exists at the point with x- x+3 coordinate 3? a. lim A(x) b. A(3) c. 0 d. Nothing else. The one limit is sufficient. 10. Determine lim x- x' + x3. x - 15 a. 3165 C. -3165 b. 1356 d. -1356