Arithmetic Operations

Is Python a case sensitive language?
What will be the output of the following code?
x= 2,7
print(x)
What will be the output of the following code?
x=5.5
y=5.5
print(x+y)
What will be the output of the following code?
a=25.0
b=5.0
print(a%b)
What will be the output of the following code?
i=47
j=25
i=i%10
j=j%10
print(i*j)