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Imagine a new pasture with grass growing on it. every day after the seeds have germinated, the number of blades of grass in the pasture triples. after 18 days, the entire pasture is completely covered in grass. how many days did it take for the pasture to be one-third covered in grass?

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Write the expression 7x^3-28xy^2 as the product of 3 factors