book Maths Puzzle Numerical Ability

Find det A, given A = [-1 0 1
2-1 3
0 1 5]

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book Other Question

Please help me work through this problem:

x - 5x^1/2 + 6 = 0

I know the answer is {4,9}

Thanks! FORMULA FOR CALCULATING PERCNTAGE DIFFERENCES OF 1 AMOUNT TO ANOTHER.
SUCH AS $6.00IS WHAT PERCENTAGE OF $5.80?