book Maths Puzzle Numerical Ability

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

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I am a distance learner and I am having difficulty solving this equations. My book has no examples and I am utterly lost.


Solve:

1/2x + 1/x = 3/8




Solve:

x/5 = x find the roots of x^3-0.165x^2+3.993*10^(-4)=0