exam Maths Puzzle Numerical Ability

I am having problem solving this question. Please kindly help me.

Ronnie invested P dollars in a 2-year CD with an annual rate of return of r. After the CD rolled over three t

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exam Other Question

Given the quadratic equation x^2+5x+3 whose roots are A and B, find without solving the roots, a quadratic equation with the values of:
1. 2A,2B
2. 3a-2, 3b-2
3. a+b, ab
4. a^2 How would I simplify this rational expression that is in fraction form?
9-b^2/b^2-b-6
I came up with -b+3/b-2. Is that correct?