The population of a small town is increased by 25% two years ago and decreased by 25% last year
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So the population is 4500 now. We know last year the population decreased 25% so we have the population last year - 25% = 4500 so we can write x - 0.25x = 4500 then we solve for x and we get 6000. Then before the population was 6000 we know it increased by 25% so we have x + 0.25x = 6000 so we solve for x and we get 4800
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Consider the equation of a circle x^2-2x+y^2-4y-4=0. If the line 2x-y+a=0is its diameter. Then find the value of a.
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