book Maths Puzzle Numerical Ability

What expression raised to the fourth power is 81x^12y^8z^16?

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The problem states: A computer is on sale for $1600, which is a 20% discount off the regular price, what is the regular price. I need to know the equation for types of problems l A square is inscribed in a circle whose radius is 4 cm. Find the area of the portion between the circle and the square.