exam Maths Puzzle Numerical Ability

(rs) radical sign

simplify

(rs)75a^2/(rs)5

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exam Other Question

if x= 4 and y= -2, the value 0f 1/2xy^2 is? (^2 means squared).
Is the xy squared or just the y and how do you solve it?
(this problem is Question 17 on the Math A, August 2006 Packet @regentsprep.org). 3logx+3=1