exam Maths Puzzle Numerical Ability

2abs[{{2t-5}/3} -3>=5] Note: { } are used to denote fractions. Please help. Thankx.

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exam Other Question

when you have a equation that has a radical on the bottom of the fraction you are not suppose to have radicals on the bottom of the equation so how would you solve a problem like that? Evaluate
f(x)=3x^2-4x-3 at f(x-1)

am i posting this question in the right place?