book Maths Puzzle Numerical Ability

2y squared + 2=9y

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y=(2/3)x-5 Please help me on this question. In 1990, the population of Alabama was 4,040,587. In 2000, the population was 4,447,100. Find the percent of change from 1990 to 2000. i know the answer is 10.1% I just dont know how to work it. please help. thank you.