book Maths Puzzle Numerical Ability

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=?

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book Other Question
Is this corect:if rank of matrix A is <= n-2 than rank of adj(A)=0 could you please tell me how to find the surface area of a rrectangular prism?