exam Maths Puzzle Numerical Ability

is this perpendicular or parallel

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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 what is the average speed if a train travels 75 miles in 55min.