book Maths Puzzle Numerical Ability

How should $9000 be divided into two accounts, paying 5.5% and 8% interest, so that the total interest after one year equals $630?

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book Other Question

i need help factoring trinomials with a coefficient of x2 greater than 1 for example 3x2(square)+10x+8 By solving the following quadratics deduce two rules for the sum and product of the roots of a quadratic using a, b, c.

1. x2 - 5x + 6 = 0
2. x2 = -6x + 7
3. x2 + 12x + -27
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