book Maths Puzzle Numerical Ability

find the roots of x^3-0.165x^2+3.993*10^(-4)=0

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I have one more problem! Interest is compounded annually. Find the amount in the account after the given length of time. round to the nearest cent. HERE THE PROBLEM! PRINCIPAL $400 change 7 over 250 ( this is a fraction) to a decimal number and round to three decimal places