exam Maths Puzzle Numerical Ability

How do you write and algabric expression in a word problem. Can you give me some examples.

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exam Other Question

I have to simplify this expression: (2a^2/3b^4)^-3. My answer is 1/2a/3b^2. Is this correct? please solve this using quadratic equatin with factoring method

m^2/18 - m/6 - 1 = 0