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(a) Find the gradient of the curve y=2x-7x+4 when x=-2. (b) A is the point (7, 2) and B is the point (-5, 8).

(a) Find the gradient of the curve y=2x-7x+4 when x=-2. (b) A is the point (7, 2) and B is the point (-5, 8). (i) Calculate the length of AB.

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