exam Maths Puzzle Numerical Ability

In the year 2006 it was discovered that global population was increasing at the annual rate of 1.7%. In what year will the global population be double?

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Pls , help me to solve this problem"
(2x^3+x^2)-(8x-4)=0
Thanks
2. Divide:
x2 – 9x + 20 ÷ x2 – 16
3x – 15 9x + 36