Step 1:
\a)
\The function is 
Consider 
Find the inverse function.
\
Interchange the variables
and
.

Squaring on each side.
\
Above function is in the form
.
The inverse function is
.
Step 2:
\b)
\The graph of the functions are
and
.

Step 3:
\The function is 
The inverse function is
.
Observe the graph, the relationship between functions
and
are symmetric about
.
Step 4:
\d)
\The function is 
The domain of a function is all values of x, those makes the function mathematically correct.
\Since there should not be any negative numbers in the square.
\The domain of the above function is all non negative real numbers.
\Domain of
is
.
The range of
is equal to the domain of
.
The inverse function is
.
Range set is the corresponding values of the function for different values of x.
\Since for all non negative real numbers of x, the function is greater than equals to zero.
\The range of the function is always greater than or equal to zero.
\Range of
is :
.
The domain of
is equal to the range of
.
Solution :
\a)
\The inverse function is
.
b)
\The graph of the functions are
and
.

c)
\
and
are symmetric about
.
d)
\Domain of
is :
.
Range of
is
.
Domain of
is
.
Range of
is :
.