If 1/4 of a number equals 1/20, then 5/4 of this same number

What is the inverse of the function f(x)=2x+1

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 ?

The functions f(x) and g(x) are shown in the graph f(x)=x^2 what is g(x) ?