book Maths Puzzle Numerical Ability

find the value or values of X in the quadratic equation x2 = 6x - 9
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book Other Question

Gracie Lee deposited $20,000 in a savings account at 4% interest compounded semiannually. At the beginning of year 4, Gracie deposits an additional $70,000 at 4% interest compounde -3/4 / -2/3=