Discover Questions

What does the sun and a crescent moon together mean? If the pattern of a distance time graph is in straight line what is the type of motion? What are the principle behind measuring and laying out using tape too long and too short? SO2 -> ? K2Cr2O7? How do I use de Moivre's formula to evaluate (cos pi/7 + i sin pi/7) ^7 in cartesian form?