Using the same symbols as above but adding: h = depth of impression in mm I found that h = (1/2)[D-(D^2-d^2)^0.5] which is mighty convenient since then the formula for Brinell Hardness Number reduces to: BHN = P/( pi * D * h ) this is surely a lot easier to calculate than the previous formula, and, since it's linear, it lends itself to direct ... Nov 09, 2010 · chemical formula of Be and S? We are supposed to use the Lewis dot structure, i put the answer Be + S = BeS but i'm not sure it is right! : This matches the time for computing the n th Fibonacci number from the closed-form matrix formula, but with fewer redundant steps if one avoids recomputing an already computed Fibonacci number (recursion with memoization). Identification. The question may arise whether a positive integer x is a Fibonacci number. This is the aptitude questions and answers section on "Simple Interest Important Formulas" with explanation for various interview, competitive examination and entrance test.