exam Maths Puzzle Numerical Ability

Multiply and simplify by factoring.

sqrt ( 27 ) * sqrt ( 375 )

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exam Other Question

A Dodecahedron is composed of how many regular polygons?

thanks^_^ Is there any one that knows how to work this problem?
Find the zeros of f.
f(x)= -x^(2)e^(-x)+ 2xe^(-x)