exam Maths Puzzle Numerical Ability

Simplify: (27^(-2x))(25^x)(3^(6x))^1/2 / 9^x(625^(x-1))^-2

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exam Other Question

need help solving the linear programmingd model graphically.
Maximize z= 1.5x1 + x2
subject to
x1 is less than equal to 4
x2 is less than equal to 6
x1 + x2 is less than equa Hi! I need help solving

(x^-2+y^-2)/(xy+x^-2y^-2)

Thanks for the help in advance!