Answer:
Simple, really
Explanation:
3Rd one is pretty easy, all you have to do is read closely.
Answer:
Close or disable all unused running apps.
Explanation:
Closing programs running in the background on your computer or mobile device helps to free up system resources for your other programs. These problems can be resolved where your system is running slowly or two programs are trying to use the same device hence causing the device or system to drag.
A computer is a electronic that helps you access the internet/WiFi
Library books and items bought in stores are 2 different applications that make use of barcodes.