book Maths Puzzle Numerical Ability

I need help with the following problems:

determinant

2 4
-3 5

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book Other Question

How do you change 28/9 to a mixed or whole number. Hello. The problem is cube root of 10/9x^2. I have come up with the cube root of 30x/3x. Can someone please verify if I have the correct answer? Thanks in advance.