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A manufacturer sells belts for $13 per unit. the fixed costs are $1200 per month, and the variable cost per unit is $9? Triple order for X-2y+3z=-3, 2x-3y-z=7, 3x+y-2z=6? How to calculate the time a torsion spring deflects when a force is applied? I need the formula but cant find it anyway.? What is the Apolonius of Perga Circle? Si una molécula es transportada en la célula en contra de su gradiente electro químico usted esperaría que el transporte sea pasivo o activo?