book Maths Puzzle Numerical Ability

Simplify 7/sqrt 3

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i need to find the surface area of a rectangular prism with a height of 9.5, length of 6, and width of 2. thanks

also what is the volume of those same lengths and what not. I could not figure this question out....3y2-2brackety-(3-2y)bracket=3(y-2)to the 2nd power -12? The choices are a)0 and -1 B)0 and -2 C)0 D)-1 E)-2 Thank you for your time.