exam Maths Puzzle Numerical Ability

Pls , help me to solve this problem"
(2x^3+x^2)-(8x-4)=0
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solve the inequality and show all work. 2/x+5 is < or = to 3/x-1 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?