book Maths Puzzle Numerical Ability

WHAT IS A PRISM?

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I do not understand how to solve this inequality:
(3t-4)/3>or = (2t+4)/6+(5t-1)/9

Thank you. Simplify:
In a square root sign
6xy^(1/3) multiplied by another square root sign 12x^(1.2)y

I couldnt find the sign on the keyboard sorry!!