Hi, I'm working on some problems for reviewing, but I'm not sure if the answers I'm getting are the right one. Please help me check if they're right. If they're not please let me know and I will post my work to see what I have done wrong.

1. Find http://www.mathhelpforum.com/math-he...8f4dd24a-1.gif

http://www.mathhelpforum.com/math-he...0c46db20-1.gif

http://www.mathhelpforum.com/math-he...fee854bc-1.gif

2. Find the equation of the line tangent to http://www.mathhelpforum.com/math-he...a7556289-1.gif at http://www.mathhelpforum.com/math-he...91cf72fe-1.gif

http://www.mathhelpforum.com/math-he...2c53e1d5-1.gif

3. Find the point P on the graph of http://www.mathhelpforum.com/math-he...65e192fe-1.gif closest to the point http://www.mathhelpforum.com/math-he...09de9ad1-1.gif

http://www.mathhelpforum.com/math-he...57281fdc-1.gif

4. Calculate the surface area of revolution of http://www.mathhelpforum.com/math-he...ba5dc2ed-1.gif about the x-axis over http://www.mathhelpforum.com/math-he...dfa97a84-1.gif

http://www.mathhelpforum.com/math-he...9f733f8b-1.gif = http://www.mathhelpforum.com/math-he...1839ae0e-1.gif