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Find the equation of the line that passes through the point -2, 12 and -5, 21? How many drops equal 25 milligram? What is the minimum atomic radius required for a cubic closest-packed metal to accommodate boron atoms(radius 88 pm)in its octahedral holes? The area of a new park in the shape of a square is 10x^2+7x-12. What is the length of the side of the park? Find the solution for the following exact differential equations. 2xy^2 + 4 = 2(3 - x^2y)y' ; y(-1) = 8?