book Maths Puzzle Numerical Ability

Solve for x:

1 1 22
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x - 4 x + 4 x� - 16</PRE>

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book Other Question

Suppose that $2,500 is invested at 7% compounded quarterly. How much money will be in the account in
(A) 3/4 year?
(B) 15 years? if i invest $2028 for 12 years at 7% compounded quarterly, how much will I have?