That will depend on the specific software you will be using to do your work and the requirements and compatibility of that software. This is a mid-level, moderate use configuration, with its AMD A6-9225 processor. This Dual-Core processor has a base speed of 2.6GHz and a boost speed of up to 3.0GHz. This configuration has 4GB of RAM. It is good with Microsoft Office type programs, internet browsing and other moderate work. This model ships with Windows 10 S-Mode Operating System. Windows 10 S-Mode provides added security by only allowing APPs available ( and therefore certified by Microsoft) at the Microsoft Store. If you don't need the added security or you need to install APPs not available at the Microsoft Store, you can switch to standard Windows 10 Home 64-bit Operating System, at no additional cost.

You can cast an Android device to a Windows 10 device. Here is a link to instructions for doing this: https://support.honeywellaidc.com/s/article/Android-Cast-Mirror-the-screen-to-a-PC-TV-or-Chromecast

No. The RAM is soldered to the motherboard and is not upgradable.

That will depend on the requirements and compatibility of iTunes. We recommend you check with the software publisher's web site for their compatibility with Windows 10 Home 64-bit operating system and the minimum/recommended hardware requirements (Is a Graphics card required, the processor speed and the minimum required system RAM and the minimum available hard drive space) to run their program, then compare those requirements to this system's configuration.