exam Maths Puzzle Numerical Ability

convert to a decimal:

(2/3)^-1

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Factor.3a^2(a-b)-6a(a-b)+21(a-b)

Please assist me with the proper way to do this problem.

Possible answers: A: (3a � b)(a^2 � 2a + 7), B:3(a � b)(a^2 � 6a + 21),
C:(a � b)(3a^2 � 6a + 21)D:3(a � b)(a^2 � 2a + 7).

Thanks The median of a set of 9 consecutive integers is 42. What is the greatest of these 9 integers?