exam Maths Puzzle Numerical Ability

Please help solve for vertex, axis of symmetry, y-intercept.

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

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exam Other Question

what is close circle ,open circle,solid line?and when do we use those? Find the determinate of the matrix
(8 + 4a 4)
(5 + 3a 3)

Possible answers are:
a.) 4
b.) 44
c.) 4 + 24a
d.) 44 + 24a