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Is there a diameter earths solar system? How many grams of KCI can be dissolved in 100g of water at 80 C? If (2x+1/3x)=6 what is the value of (3x-1/2x)^2? The nitrogen cycle? The position of an object at time t is given by s(t) = -4 - 2t. Find the instantaneous velocity at t = 6 by finding the derivative ?