The function f (x) = 1/5 is translated up 4 units. Which equation represents the translated function?

To translate a function upwards by 4 units, you add a constant of four to the function.

If f (x) truly is just a constant 1/5 which is just a horizontal line ...

f (x) + 4=1/5+4

g (x) = (1+20) / 5

g (x) = 21/5

g (x) = 4.2