Calculate midpoint of (8,4) and (12,2)

Show me how you find y and z and determine what y and z are you i appreciate it : )

Anew shopping mall is gaining in popularity. every day since it opened, the number of shoppers is 5% more than the number of shoppers the day before. the total number of shoppers over the first 10 days is 1258 how many shoppers were on the first day?

Me d is also an option but i couldn't get it in the picture