exam Maths Puzzle Numerical Ability

Simplify the radical expression. Assume all variables represent positive real numbers.

square root 12a^3/25

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exam Other Question

((((2a^2)^3)))
_________
(3b^3))))

the ^3 applies to the whole problem the line is suppose to implie that 2a^2 is over the bottom. Any help you can give me would be awesome. simplify completely. 5w^2/3rs/20wr/s^2.. i got ws/12r^2 .. is that correct