exam Maths Puzzle Numerical Ability

Simplify

1 / -16^-3/4

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In a chemistry class, 12 L of a 12% alcohol solution must be mixed with a 2% solution to get a 14% solution. How many liters of 20% solution are needed?
I must facgtor completely the polynomial. Indicate any that are not factorab le using integers.
That would be x cubed - 64x. The 64x is throwing me off....Please help.
x^3-64x