A MacBook will run Mac OS X 10.6 (Snow Leopard). If the MacBook is currently running 10.5 (Leopard) a copy of Snow Leopard will need to be purchased.
Probably not.
You cannot. With the introduction of the MacBook Pro Retina line in 2012, it's not possible to upgrade your RAM as you could with previous MacBooks.
No! The processor is soldered with the logicboard/motherboard. they only way to change/upgrade the processor of a macbook pro is to do it when you purhase new macbook pro. hope this helps...
Generally, Macs are not easily upgradable, no. Sometimes they are, but usually not.
No you have to buy it installed into the computer unlike windows which you can upgrade with a disc (I did when windows 8 came out).
Apple sells only only one version of the Macbook Pro 15". You can upgrade the processor, ram, hard drive, and display if you wish. If you are using this Macbook as a student, I would recommend you get the Macbook Pro 13" base model and save yourself $600. It is all a student will need. However if you are looking for the best laptop you can get for your own use then the 15" is the best of the best. Unless you are doing graphics and or video editing you have no need to upgrade it. Only you know what you need.
--- Update --- This is not possible; you must use a macbook install disc or a generic install disc.
You would be downgrading if you buy an iPad to replace your macbook. I have a macbook and the iPad is nothing close to it. iPad is just nice for browsing, email, chat, and a bunch of apps. It can't do nearly as much as a macbook can. If your macbook is old, then sure, throw it out and get an iPad, but keep in mind that iPads don't have much hard-disk space. They range from 8 to 64 gig. Macs come with at least 160 and can go up to 500 gig.
XCode for will work on any standard MacBook Pro no upgrading is required. If the Mac is running Lion (OS X 10.7) it will need XCode 4.1.
You can't add additional RAM to a Macbook Air because the RAM module is soldered onto the motherboard. Apple has been migrating this way with a myriad of devices including the iPod, iPhone and iPad product lines.
Yeah it is totally worth it.
That 128GB drive is actually an SSD not a Hard Drive and no it isn't possible to replace the internal drive in a mac