Why is the 4/5 in parenthesis when writing 4/5 ^4

4/5 ^4 meaning 4/5 to the power of 4

Which of the following best describes the graph below? + + 2 + 3 + 4 1 o a. it is not a function. o b. it is a one-to-one function. o c. it is a many-to-one function. o d. it is a function, but it is not one-to-one.