exam Maths Puzzle Numerical Ability

x to the 2nd + 7x + x to the 2nd - 4x
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x to the 2nd - 5x x to the 2nd - 5x

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how do you solve x^3=1 An investment of $10,000in 1997 in the spartan Investment Grade Bond Fund grew to $14,000.61 in 2002. Use the fomula r=(s/p)^1/n -1 to find thr 5 year average annual return.