Anyone can explain this code?

Question

import math
x="a"
x+=str(math.sqrt(25))
print(x)

output: a5.0

Answer 1

math.sqrt(25)= 5.0
#return type is float

x+=str(5.0)
print(a) - a5.0

Answer 2

x is a string
math.sqrt(25) is a string

The + sign concatenates strings:

a = "as"
b = "tra"
c = a + b

c = "astra"

Answer 3

it says x is letter "a"
then it adds the square root of 25 into x so it becomes a5.0