book Maths Puzzle Numerical Ability

could you please tell me how to find the surface area of a rrectangular prism?

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book Other Question

please help me solve these following questions:
simplify the following radicals. :
squar foot of 50=?
squar foot of 325=?
squar foot of 96=?
squar foot of 256=? Prove that i^i=e^-(4n+1)^p/2