exam Maths Puzzle Numerical Ability

simplify the following expression and rewrite using only positive exponents:
(assume that the bases are not zero)

(2abc^5)^3(3a^4b^-4c^-3)^3

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exam Other Question

Is there any one that knows how to work this problem?
Find the zeros of f.
f(x)= -x^(2)e^(-x)+ 2xe^(-x) The lenght of a rectangle is one inch less than twice its width. The diagonal of the rectangle is two inches more than its length. Find the area of the rectangle.