exam Maths Puzzle Numerical Ability

evaluate the determinant:

3 4
-1 2

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exam Other Question

the cos of an angle is -0.5. Determine the angle if it is in the second quadrant. What is the angle if it is in the tird quadrant? -1 -2 =
@ The Order of Operations requires exponents to be evaluated first, and exponents only apply to whatever they are immediately attached to; subtraction (from 0) comes last