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What is x1+x2+x1*x2 means? Red Giant a very dense ball may form from a supernova? How would you find the area of like a triangle but with circularly rounded corners? Each bolt is 7/8 of an inch long if I lay 9 bolts end to end, how long will the lin3 be.? If 5.83 mol of CO occupy 21.0 L, how many L will 17.5 mol of CO occupy at the same temperature and pressure?