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4.5 a = 73° b = 17° c = 66° d = 87°


Question 5 5.1


x = y


(sum angles triangle ABC) (alternate angles, AB ∙∙ CD) (straight line angles)


(sum angles triangle CEF) (5) [17]


y = – 1


_ 3 x – 4


(5) 5.2.1


5.2.2 An exponential graph. 5.2.3 After 10 minutes there will be 4 10 bacteria = 1 048 576 bacteria.


Question 6 6.1.1 x = √


_______ 3 2 + 4 2 ( Pythag )


x = 5 cm Surface area = 2


Volume = 1 = 216 c m 3


__ 2 ( 8 ) ( 3 ) × 18


= 24 + 180 + 144 = 348 c m 2


( 1 __


2 × 8 × 3 ) + 2 ( 18 × 5 ) + 18 × 8 (2) 352 Section 4: Teaching Mathematics


(3) (1) (2)


[11]


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