=-4 C. a=6 ,b=4 D. a=6, b=-6 E. a=-4, b=-6 The solution set the system of equation x2-8x+y=0, y=2x is A. {(0,0),(12,6)} B. {(0,0),(6,12)} C. {0,12} D.{0,6} E.{(0,12),(0,6)} The equation p2+6p-2=0 can be

and the area of 16 cm2,then the radius of the circle in cm , is A. 2 B. 3 C.5 D. 48 E. 12 OAB is a sector of a circle with centre O, radius 8 cm and a perimeter 22 cm. Then the area of sector, in square

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