What is the midpoint of -1.9 and 5.1 on a number line??!

According to the data set, where should the upper quartile line of the box plot be placed?

What is the slope of the line that contains the points (-2,1) and (0,-3)

Pepe and leo deposits money into their savings account at the end of the month the table shows the account balances. if there pattern of savings continue and neither earns interest nor withdraw any of the money , how will the balance compare after a very long time ?