exam Maths Puzzle Numerical Ability

Please help me solve this problem:
2^n / 1000 < 1000n^2

I am trying to use the log base 2 to solve but keep on getting stuck.
Please help

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exam Other Question
I could really use some help with this:
Solve the problem:
p(x)+-0.002x²+1.2x-300

Thanks in advance 3 radical 25 over 4