exam Maths Puzzle Numerical Ability

w-(-43.7)=-4.342

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exam Other Question

Using coordinate geometry,prove that the segments joining the midpoints of adjacent sides of W(0,0), X(2b,2c), Y(2a+2b<2c) and Z(2a,0) form a parallelogram. I don't know if this he I need help with the following problem:

In the following sequence, what could be the next term? 1, 4, 27, 256, ... why is it the next term?

Any explanation would be helpful.
Thanks in advance.