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Radius of Gyration? REALLY need help ASAP! Hey - If any of you can help me with the following problem asap that would be awesome! A racquet consists of uniform lamina that occupies the region inside the right-hand loop of r^2 = cos 2theta on the end of a handle (assumed to be of...

oh nm oh nevermind... that was a stupid question. I see it now. Got any suggestions on the other problems? :)

okay, so it's <-9. -6. 12> Does it make a difference though?

I am very confused regarding a few problems in Calculus III. Any help or hints to any of these would be greatly appreciated! 1.) Are lines L1 and L2 parallel? L1: (x-7)/6 = (y+5)/4 = -(z-9)/8; L2: -(x-11)/9 = -(y-7)/6 = (z-13)/12; The answer says that they are parallel, which I...