Helton, Floyd Franklin,  1912- <br/><br/>
Precalculus mathematics /  a functions approach 
Floyd F. Helton, Margaret L. Lial 
 - Glenview, Ill.  Scott, Foresman  1983 
 - xi, 514p.  ill.  24cm. 
<br/><br/>Includes index 
<br/><br/><label>ISBN: </label>0673155072  RM89.28 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Functions<br/>Mathematics<br/>Precalculus