exam Maths Puzzle Numerical Ability

evaluate the determinate:

3 -1 1 2
-2 0 0 0
2 -1 -2 3
1 4 2 3

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exam Other Question

How do you add an expression like this: n-2/n+4 + 8/n+4? Carol has 18 coins with a total value of $3.45. If the coins are dimes and quaters, how many of each kind are there?