Explain the effect f (x)+k has on the graph if the exponential function f (x) be specific and use complete sentences for full credit.

The +k part of the function takes the original function and translates it straight up k units. It's as simple as that.  If your function is the line f(x) = 3x, then the function f(x) = 3x + 4 moves that first function up 4 units.