book Maths Puzzle Numerical Ability

Simplify the following. (-3w^2n)(2n^2)^4

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book Other Question

If I know the length of two sides of a triangle, how do I find the length of the third side? how do i do this problem?

{{{20x^3}}} over{{{4xy^2}}} x (times) -6xy over -x




(they ARE fractions)
thnx