It could be 91B + 7M.
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A numerical expression is a combination of numbers and mathematical operators, but nt including an equality or equality sign. For example, min(2,3,4) + 3*sin(pi/2)/[sqrt(7) - 3.5*7.21.5] where min is the operator that return the minimum value of its arguments.
91/7 = 13
13 * 7 = 91
7 x 91 = 637
As 91 = 7 × 13, √91 doesn't really simplify. It can be changed into: √91 = √(7×13) = √7 √13