exam Maths Puzzle Numerical Ability

Please explain why it is that -3^4=-81(a negitive number),
yet, -(3)^4=81, a positive number.
Is it because 2 negitives= a positive?

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exam Other Question
Simplify:

(6+1/3)/(3-2/9) A circle has a diameter with endpoints (-8,-1) and (-3,13). Find the center of the cicle. Find the area of the circle.