With only one layer, you have the choice. It's a little more expensive to strip first, about 25% more, but an advantage of stripping is that your roofer will have the opportunity to replace damaged sheathing. Shingles nailed into splintered sheathing may not hold well.
Below you can see some of the things you might choose to do with your MBA degree: 1. Become a teacher at a college: After you obtain your Masters degree, you are qualified to apply at local universities and colleges. Since, these institutions ask for someone with experience, do not miss an opportunity to speak, mentor, teach community education classes, deliver panels, etc.
MBA students are generally more risk averse than the average entrepreneur. An MBA is helpful if you aren't sure what you want to do, because you can meet people from all over the world from different industries and different functions. It also helps with presentation and speaking skills (although some people take it too far and come across as arrogant as some of the other answers noted).