![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
Factor the each monomial.
\rs3 = r · s · s · s
\s3t= s · s · s · t
\r2st2= r · r · s · t · t
\The GCF is the product of the common prime factors in each monomial.
\GCF = s
\The greatest common factor of rs3, s3t and r2st2 is s.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The greatest common factor of rs3, s3t and r2st2 is s.