No z score should ever exceed 1.0

The graph shows the function f(x) = (2.5)x was horizontally translated left by a value of h to get the function g(x) = (2.5)x–h.

When only separate discreet points are graphed it is called?

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)