book Maths Puzzle Numerical Ability

please help me with this problem. what is the value of the determinant.
[3 6 8]
[2 4 0]?
[3 6 8]
(this is one determinant)

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book Other Question

Factor 3x^3 - 2x^2 - 37x - 12 given that x + 3 is one of the factors.
I really need some help thank you for your time
The perimeter of a rectangle is 50ft. The width of a rectangle is 5ft. less than the length. Find the length and the width of the rectangle. P = 2w +2L