Ineed to know how do i do this in what's the answer to the question

The table shows the balance of a money market account over time. write a function that represents the balance y(in dollars) after t years.

For g(x) = 5x - 3 and h(x) = [tex]\sqrt{x}[/tex], find (g · h)(4)

1.based of the diagrams what is the the value of x? 2.how would you verify your answer for x