Classify the function as a polynomial function, rational function, or root function, and then find the domain. Write the domain in interval notation.
-$$f ( x ) = \sqrt { 21 - x }$$
A) root function; $( \infty , \sqrt { 21 } ]$
B) root function; $( - \infty , \sqrt { 21 } ) \cup ( \sqrt { 21 } , \infty )$
C) root function; $( \infty , 21 ]$
D) root function; $( - \infty , 21 ) \cup ( 21 , \infty )$

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The Answer of Classify the function as a polynomial function, rational function, or root function, and then find the domain. Write the domain in interval notation.
-$$f ( x ) = \sqrt { 21 - x }$$
A) root function; $( \infty , \sqrt { 21 } ]$
B) root function; $( - \infty , \sqrt { 21 } ) \cup ( \sqrt { 21 } , \infty )$
C) root function; $( \infty , 21 ]$
D) root function; $( - \infty , 21 ) \cup ( 21 , \infty )$

Classify the Function as a Polynomial Function, Rational Function, or Root