Find the distance between the two points rounding to the nearest tenth (if necessary). (5,-5) and (8,-8)

I’m stuck on this equation, anyone got the answer?

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 ?

Someone me what is the area of this figure? 18m 18m 8m 16m