exam Maths Puzzle Numerical Ability

I have to simplify this expression: (2a^2/3b^4)^-3. My answer is 1/2a/3b^2. Is this correct?

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Can someone please help me with problem?

These data represent the population of a certain geographic region.
Year Population (in millions)
1950 34
1960 38
1970 43
1980 How do you write and algabric expression in a word problem. Can you give me some examples.