- Can any one answer this question for discrete math?

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Is the tension between two moving objects the same as the tension between two still objects? At a store, 2 gallons of milk cost $6. Which is the value of the ratio of dollars to gallons of milk? Calculate the pH of a 0.725M solution of nitrous acid, HNO₂.? How do you find the length from the vertex of a regular tetrahedron to the center point of its opposite face? Solve x^2+x+1=0?