TY  - BOOK
AU  -  Helton,Floyd F.
TI  - Precalculus mathematics: : a functions approach
AV  - QA39.2.H4  1983 
PY  - 1983///
CY  - Dallas : 
PB  - Foresman and Company Scott
KW  - Mathematics
KW  - Functions
N1  - Includes index
ER  -