Help me with maths pleasee

Acircle has a diameter will endpoints of (-2,8) and (6, 4). what is the center of the circle

Find the area of a parallelogram with base 15 yards and height 21 2/3

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 ?