exam Maths Puzzle Numerical Ability

What is the determinant of:
2 3 0 0
0 -1 0 1
0 0 1 -1
0 0 -2 1

(All numbers are in a big bracket)
Thank you!

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exam Other Question

The statement is use a proportion to solve each problem. Round your answer to the nearest tenth or to the nearest tenth of a percent. 45 is 75% of what number? Find 62% of 70? 5 is Sove the porportion.

9. a/5 = 27/45

Any help with this equation would be Greatly</b> appreciated.