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How can rates be converted to unit rates? Find the indicated limit, if it exists. lim f(x), x approaches 9 {x+9 , x < 9} { 27-x , x>9}? Does anyone know the website that can find a pattern between any group of numbers? Describe and correct the error in the following statement. If -6 is a solution of the polynomial equation f(x)=0,then -6 is a factor of f(X)? Calculus help? limit as x approaches negative infinity of (sqrt(9x^2+x)) -3x?