exam Maths Puzzle Numerical Ability

I need help with this math problem. Mary invested $40,000 at 4 1/2% compounded continously. How long will it take for Mary's investment to reach $68,000

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I would like your help in determining the possible roots to the equation:
-x^4-5x^2-x+7=0. Judging from the sign changes, there appears to be 1 positive root. And 1 negative root. Does that mean there could be 3 imaginary roots? Suppose that the width of a rectangle is 2 inches shorter than the length and that the perimeter of the rectangle is 80.

A) Set up an equation for the perimeter involving only