I have spent the last half hour trying to solve these problems and cannot figure them out, i keep getting the wrong answers. I literally do not understand how to solve these problems. If anyone knows how to do them can you please help me out because i would much appreciate it if you would. Thank you

1. Find the radius of convergence and the interval of convergence.

http://edugen.wileyplus.com/edugen/share%E2%80%A6

2. Use sigma notation to write the Taylor series about x=x_0 for the function.

http://edugen.wileyplus.com/edugen/share%E2%80%A6

3. Find the radius of convergence and the interval of convergence.

http://edugen.wileyplus.com/edugen/share%E2%80%A6