Built-in Functions

.Which of the following functions is a built-in function in python?
What is the output of the expression?
round(2.578)
What is the output of the following function ?
hex(10)
What is the output of the function shown below?
import math
print(math.floor(5.5))
What is the output of the function shown below?
import math
print(abs(math.sqrt(16)))