0
c is a pro-numeral
3c
Ralph C. Steinlage has written:
'College algebra and trigonometry' -- subject(s): Algebra, Trigonometry
'S.G. College Algebra'
'SM Coll Alg & Trig'
'College algebra' -- subject(s): Algebra
C. A. Van Velzer has written:
'University algebra' -- subject(s): Algebra
-2c