exam Maths Puzzle Numerical Ability

Thank you in advance for help with this equation. x^4-8x^2+11=0

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Can someone please help me with this word problem! Thanks a lot.

If $3000 is invested in an account that pays interest compounded continuously, how long will it take to grow $6000 at 7%?
Bilogists tagged 500 fish in a lake on January 1. On February 1 they returned and collected a random sample of 400 fish, 8 of which had been previously tagged. Approximately how ma