book Maths Puzzle Numerical Ability

Express the following expression in simplest radical form. All variables represent positive real numbers.

SQRT of (8y^3)/49x

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book Other Question

Hi. Could you explain how to do the following problems using the Pythagorean Theorem to find x?

1. Triangle with legs of 4a and 3a, find x.

2. Equilateral triangle, with x running down the center.

Thanks for any help you can give. perform the indicated operation

(6y^2 - y - 2) divided by 2y + 1/3y - 2

I have no clue. Any help would be greatly appreciated. Thanks in advance.