- Need help understanding how to simplifying expression (x+9)-5, 8(-b - 4), 6(-5n+7)?

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SO2 -> ? K2Cr2O7? Im having trouble on these last 2 biology questions I have. Any help would be great. Thank You.? What are the principle behind measuring and laying out using tape too long and too short? What geologic features are associated with each type of convergent boundary? How do I use de Moivre's formula to evaluate (cos pi/7 + i sin pi/7) ^7 in cartesian form?