exam Maths Puzzle Numerical Ability

Is there a way or maybe an equation to tell what an imaginary number is going to be?


For example: i to the 14th power would be...

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Please help me with this question:
A small firm produces both AM and AM/FM car radios. The AM radios take 15 h
to produce, and the AM/FM radios take 20 h. The number of productio
How can I use these regions to find max. & min. values of the given objective functions? Your help is received with many thanks.
z = 4x + y
z = 5x + 6y
z = x + 2y
z = x + 6y