- In solid magnets the source of magnetism is ?

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Surface by rotating the arc y^2=9x from x=0 to 4 through 2π around x axis is 49π.Show that
x̄ of this surface is: 3/49*integral{x(4x+9)dx}? Can someone help me out with a Statistics problem?? File is attached with problem.? What is the mass of nitric acid that can be produced from 549g of ammonia? Please include steps so I can learn to do it on my own, thanks!? 2, 2 -diethyl- 4- (2,2 dimethylpropyl) decane ?? The bond line drawing ? What is Maple?