exam Maths Puzzle Numerical Ability

Simplify the expression. Write answer with positive exponents. Assume that all variabls reperesent positive real numbers.
(-27x^9)^1/3

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exam Other Question

One equation that is commonly used to model gas pressure is the van der Waals equation, RT/V-b - a/V^2, where V is the container volume, T is the Kelvin temperature, and R,a and b Anna has 12 bills in her wallet, some $5 and some $10. The total value of the bills is $100. How many of each bill does Anna have?
YIKES please help me with this one.