How can u tell the difference between a linear function and exponential in a chart?

The graph shown below expresses a radical function that can be written in the form f(x)=a(x+k)1/n+c what does the graph tell you about the value of n in this function

Translate this phrase into an algebraic expression. 21 more than twice goran's savings use the variable g to represent goran's savings. need to know fast.

What is the approximate value of  x  in the equation below.–3.396–0.7080.3040.955