Book Maths Puzzle Algebra

need help solving the equation by completing the square 3x^2-18x+28=0

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need to find the slope of the line that goes through the points (4,-4)(7,-8) I need help solving this one. The amount of tropical rain forests in Central America decreased from 130,000square miles to about 80,000 square miles from 1969 to 1985. Let y be t