Which of the following is true about file formats?

What is the first step in creating a maintenance ?

Im doing this last minute and literally none of my neighbors or people that my dad works with use excel so if anyone could me make up an example

Ihave been given the number of guns per 100, and the total firearm-related deaths per 100,000. i have to find the actual number of guns per country and actual number of gun-related deaths. if somebody could show me how to do 1 question, i can finish the rest, i am just confused. tia