exam Maths Puzzle Numerical Ability

A line with 2 points: (0,18),(9,144)

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exam Other Question

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 8 AND 1/6 DIVIDED BY 2 AND 1/3