book Maths Puzzle Numerical Ability

Find the missing factor:

(6x4) (to the 4th power) = (3x3) (to the 3rd power) = ( )

-35x2y (to the 2nd power)= (-5xy) = ( )

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book Other Question

what is the ratio of the area of a square that circumscribes a circle to the area of a square that inscribes the same circle? Can you show me the steps to get the answer for this problem.--- The problem as follows:

7x+3+10x

Thank you,
Candace