Hello, The Lenovo - Yoga C74015.6" Laptop Model:81TD0020US has 12 GB of RAM, A full size keyboard with a number pad, and 15 hours of battery life. The specs can be found here https://www.bestbuy.com/site/lenovo-yoga-c740-2-in-1-15-6-touch-screen-laptop-intel-core-i5-12gb-memory-256gb-ssd-mica/6388035.p?skuId=6388035
The Lenovo Yoga C740 14" Laptop Model:81TC000JUS Has 8 GB of Ram, regular keybard (no num pad), and 13 hours battery life. The spec sheet can be found here for further comparisons https://www.bestbuy.com/site/lenovo-yoga-c740-2-in-1-14-touch-screen-laptop-intel-core-i5-8gb-memory-256gb-solid-state-drive-mica/6367805.p?skuId=6367805

No its not. If it is running all the time on your computer, first, be sure any software you installed is compatible with Windows 10. Incompatible software will cause the computer to work harder, thereby causing the fan to run all the time. There is no need to install Microsoft Office software. The software is already part of the operating system, you just need to activate the software with a purchased product key. If you have installed a copy of Microsoft Office, this is conflicting with the existing copy on the system and this will slow your system down. If you have installed a 3rd party anti-virus program, be sure that Windows Defender is turned off and that the trial version of McAfee Anti-Virus software is uninstalled. There can only be one anti-virus program on the system. You may need to restore your system to original factory default settings if any of the programming errors have occurred. You can do that by typing "restore" in the Cortana search window. Just click on the magnifying glass icon at the bottom left of your Windows 10 Desktop. Click on "Reset This PC" Then click on "Get Started" and follow the on screen directions to restore to factory defaults. If the problem persists, we recommend you contact Lenovo Tech Support at: 877-453-6686.

Yes. So long as the printer is compatible with Windows 10. Check with your printer manufacturer for the compatibility of your specific model printer and the pairing instructions for a new Windows 10 computer.

Really that will depend on the requirements and compatibility of the software you want to use. The Lenovo IdeaPad 3 14 Laptop model number 81W0009DUS, 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. We recommend you check with the software publisher's web site for their compatibility with Windows 10 S-Mode 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.