Precalculus :  functions and graphs / 

 - 13th edition 
, 
 - Boston :  Cengage,  2019. 
 - xv, 845 pages : colored illustrations ; 26cm xv, 845 pages : colored illustrations ; 26cm 
<br/><br/><label>ISBN: </label>9781641720656 
<br/><br/><label>Dewey Class. No.: </label>REF 515.1 Sw72