book Maths Puzzle Numerical Ability

How do I do this problem?

10x^2 - 30x + 20 / x^2 - 1

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book Other Question

Solve the following system by graphing.

3x - 6y = 9

x - 2y = 9 Colin invested $24,000, part at 18% and part at 16%. If the total interest at the end of the year is $4,160, how much did he invest at 18%?

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