exam Maths Puzzle Numerical Ability

what is close circle ,open circle,solid line?and when do we use those?

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exam Other Question

Given that (3x-a)(x-2)(x-7) = 3x^3-32x^2=81x-70, determine the value of a. My answer came out to be 3, but not sure of my answer. thanks for looking over my answer. Please help solve for vertex, axis of symmetry, y-intercept.

(y=1/2x^2+4X+3)