Answer:
0
Step-by-step explanation:
11a + 9b + c + 2a
a constant is just a number...it has no variables (letters).
there are no constants in this expression
example :
3x + 2b + 7 + 4c + 2 x + 5 = 8
the constants in this are 7 and 2 constants are 5 and 8
