Can someone please help me again, i suck at math..

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 ?

3.4a=57.8 what is the the value of a

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.