exam Maths Puzzle Numerical Ability

Please help me solve this equation:
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(6+5x+6x^2+8x^3)+ (3-5x+6x^2-8x^3)

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-7/8t < -14 Carrie invested some money in a CD with a 9% interest rate. She also invested twice as much in a mutual fund with an interest rate of 10%. Her total interst earned from the 2 inv