Book Maths Puzzle Algebra

What is the best way to do this problem, logb[(3x^(1/2)y^2)^3/(z^2)]?

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Book Other Question

The sum of four consecutive even nubers is 124. What are the numbers? Janie sold her diamond necklace for $560, which was 12% more than what she originally paid for it. How much was the original price?